IFRQuick Review Sheets
IFRQuick Review Sheets
IFRQuick Review Sheets
com
Logging instrument timeA person may log instrument time only for that flight time when the person operates the aircraft solely by reference to instruments under actual or simulated instrument flight conditions.
Airplane IFR quick-review study sheets | page 1 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
IFR flight plan Required before entering controlled airspace under IFR (a clearance is also required) (91.173) How to file? o FSS (in person, radio or phone) o DUATS (online) o Through radio/phone with ATC o File at least 30 min. prior to est. departure time Stored in the system for 1.5 hours from proposed time of departure. Cancelation (AIM 5-1-14) o Towered airports automatically canceled by ATC upon landing. o Non-towered airports you must contact ATC/FSS to cancel. o Can cancel anytime not in IMC and outside class A airspace. Preferred IFR routes are published in the Airport/Facility Directory (AFD). If a preferred route is published to your destination, you should file it in your flight plan.
Obstacle Departure Procedures (ODP) (AIM 5-2-8) Only provides obstruction clearance. May be flown without an ATC clearance unless a SID or other instructions are assigned. (e.g. radar vectors) Graphic ODP denote Obstacle in the chart title. All new RNAV ODPs are available in graphical form. Found in the front of NACO chart booklets, arranged alphabetically by city name. Jeppesen charts show ODPs under the airport diagram (x0-9) page, or, at larger airports, on a separate chart. Standard Instrument Departures (SID) (AIM 5-2-8) Provide obstruction clearance and helps reducing radio congestion and workload by simplifying ATC clearances. Pilot NAV SIDs Pilot navigates by charted routes with minimal radio instructions. Vector SIDs Navigation is based on radar vectors. Routes are not printed on the chart. Some SIDs depict non-standard radio failure procedures. File NO SIDs in the remarks of your flight plan if you choose not to use them. RNAV SIDs and all graphical RNAV ODPs require RNAV 1 performance. (1NM for 95% of the total flight time). Standard Terminal Arrivals (STAR) (AIM 5-4-1) Serves as a transition from the en route structure to a point from which an approach can begin. Transitions routes connect en route fixes to the basic STAR procedure. Usually named according to the fix at which the basic procedure begins. As with SIDs, you may state No STARs in your flight plan remark section if you choose not to use them. RNAV STARS require RNAV 1 performance.
0-179 179 179 Odd d thousnads snads snad or Flight ght gh Levels ls
(91 (91.179) 91
:45 Minutes
of fuel at normal cruise
Airplane IFR quick-review study sheets | page 2 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
al app. Fix/point Basic IFR departure clearance items C.R.A.F.T C-Clearance Limit R-Route A-Altitude F-Frequency (for departure) T-Transponder code
Clearance void time The time at which your clearance is void and after which you may not takeoff. You must notify ATC within 30 min after the void time if you did not depart. Hold for release You may not takeoff until being released for IFR departure. Release time The earliest time the aircraft may depart under IFR. Expect Departure Clearance Time (EDCT) A runway release time given under traffic management programs in busy airports. Aircraft are expected to depart no earlier and no later than 5 minutes from the EDCT. Abbreviated departure clearance = Cleared () as filed () (AIM 4-4-3, 5-2-5, 5-2-6)
Mandatory reports under IFR M.A.R.V.E.L.O.U.S. V.F.R. C.500 M-Missed approach (AIM 5-3-3) A-Airspeed 10kt / 5% change of filed TAS (AIM 5-3-3) R-Reaching a holding fix (report time & altitude) (AIM
5-3-3)
Adjust the outbound leg so the inbound leg takes: o At or below 14,000 MSL 1 minute o Above 14,000 MSL 1.5 minutes DME/GPS holds fly the outbound leg to the specified distance from the fix/waypoint.
Max holding speeds
V-VFR on top (AIM 5-3-3) E*-ETA change 3 min (AIM 5-3-3) L-Leaving a holding fix/point (AIM 5-3-3) O*-Outer marker (AIM 5-3-3) U-Unforecasted weather (91.183) S-Safety of flight (91.183) V-Vacating an altitude/FL (AIM 5-3-3) F*-Final approach fix (AIM 5-3-3) R-Radio/Nav failure (91.187) C*-Compulsory reporting points (91.183) 500-unable climb/descent 500 fpm (AIM 5-3-3) *required only in a non-radar environment (including ATC
radar failure)
Up to 6000 MSL 200 KIAS 6001-14,000 MSL 230 KIAS Above 14,000 MSL 265 KIAS May be restricted to 175 KIAS on some inst. approach procedures. At Airforce fields 310 KIAS* At Navy fields 230 KIAS* *Unless otherwise depicted. (AIM 5-3-7)
IFR altitudes
DA/H Descent Altitude/Height. MAA Maximum Authorized Altitude. MCA Minimum Crossing Altitude. MDA/H Minimum Descent Altitude/Height. MEA Minimum En route Altitude. Assures navigation coverage and 1000 (non-mountainous terrain) or 2000 (mountainous) obstacle clearance. MOCA Minimum Obstruction Clearance Altitude. Provides navigation coverage and obstacle clearance within 22 NM of the NAVAID. MORA Minimum Off-Route Altitude. (Jeppesen charts). Including grid and route MORA. MRA Minimum Reception Altitude MVA Minimum Vectoring Altitude. OROCA Off-Route Obstruction Clearance Altitude (NACO charts). Assures obstacle clearance within 4NM of course. 1000 over non-mountainous terrain; 2000 over mountainous terrain.
Visibility(SM) 1/4 1/2 5/8 3/4 7/8 1 1
Position reports items Aircraft ID Position Time Altitude/flight level Type of flight plan (except for communicating with ARTCC/approach control) ETA The name only of the next succeeding reporting point along the route of flight Any pertinent remarks IFR takeoff minimums (91.175) No T/O minimums mandated for part 91 operations. Part 121, 125, 129, 135: Prescribed T/O minimums for specific runway, or, if none: 1-2 engines: 1 SM visibility More than 2 engines: SM visibility
Airplane IFR quick-review study sheets | page 3 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Lost communications procedure (91.185)
Altitude to fly M.E.A fly the highest among: M Minimum altitude prescribed for IFR E Expected (e.g. expect 5000ft after 10 minutes) A last altitude Assigned by ATC Route to fly A.V.E.F select route by the following order: A Assigned route, if none: V Vectored (fly to the fix/route/airway last vectored to), if none: E last Expected route by ATC, if none: F Filed route
Leaving the clearance limit Is the clearance limit a fix from which an approach begins? Start descent and approach as close as possible to the EFC, or ETA (if no EFC given)
At EFC or clearance limit (if no EFC given), proceed to a fix from which an approach begins and start the approach
When can you descend below MDA/ DA? (91.175) All three conditions must be met: 1. The aircraft is continuously in a position from which a descent to a landing on the intended runway can be made at a normal rate of descent using normal maneuvers. 2. The flight visibility (or the enhanced flight visibility, if equipped) is not less than the visibility prescribed in the standard instrument approach being used. 3. At least one of the following visual references for the intended runway is distinctly visible and identifiable to the pilot: (except for CAT II & III approaches) a. The approach light system, except you may descend below 100 feet above the touchdown zone only if the red terminating bars or the red side row bars are also visible and identifiable. b. The threshold. Aircraft approach categories c. The threshold markings. CAT 1.3Vso Radius for circling d. The threshold lights. (Knots) maneuver e. The runway end identifier lights. A <90 1.3 NM f. The visual approach slope indicator. B 91-120 1.5 NM g. The touchdown zone or its markings. C 121-140 1.7 NM h. The touchdown zone lights. D 141-165 2.3 NM i. The runway or runway markings. E >165 4.5 NM j. The runway lights.
Approach clearances Contact approach o Must be specifically requested by the pilot.(It cannot be initiated by ATC) o Requires at least 1SM reported ground visibility and the aircraft to remain clear of clouds. o Available only at airports with approved instrument approach procedures. Visual approach o Initiated by either ATC or the pilot. o Requires at least 1000 ceiling and 3SM visibility. (IFR under VMC) o Pilot must have either the airport or the traffic to follow in sight.
Airplane IFR quick-review study sheets | page 4 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Minimum equipment required for flight (91.205) For VFR day flight: A T.O.M.A.T.O F.L.A.M.E.SA-Altimeter
T- Tachometer for each engine. O- Oil temp indicator for each engine M- Manifold pressure gauge for each altitude engine A- Airspeed indicator T- Temperature gauge for each liquid cooled engine O- Oil Pressure gauge for each engine For IFR day: all VFR day equipment + G.R.A.B C.A.R.D For IFR night: all VFR day + VFR night equipment + G.R.A.B C.A.R.DG- Generator/alternator R- Radios (two way and navigational equipment appropriate for the ground facilities to be used) A- Altimeter(sensitive) adjustable for barometric pressure B- Ball (slip-skid indicator) C- Clock (shows hours minutes and seconds and installed as part of aircraft equipment.) A- Attitude indicator R- Rate of turn indicator D- Directional gyro (Heading indicator)
F- Fuel quantity gauge for each tank L- Landing gear position lights (if retractable gear) A- Anticolision lights (aircraft certificated after March 11, 1996) M- Magnetic direction indicator Operating with inoperative instruments or equipment (91.213) noperative E- ELT, if required by 91.207 S- Safety belts / shoulder harnesses Aircraft has a MEL? For VFR night flight: All VFR day equipment + F.L.A.P.SF- Fuses (spare set) L- Landing light (if for hire) A- Anticolision light P- Position lights (navigation lights) S- Source of power (such as battery)
Is the inoperative equipment required by: x 91.205 or other regulations for kind of operations?
xAirworthiness Directive (AD)? xEquipment list or kind of operations equipment list? xVFR-day certification requirements? Flying not allowed without a special flight permit
VOR limitations:
60,000 ft
100 NM
130 NM 100 NM 40 NM
1000 ft
1000 ft
Terminal
VOR:
Low
High
VOR- VHF Omni directional Range 108.0 to 117.95 MHz excluding frequencies at the 108.10-111.95 range with odd tenths. Full scale deflection: 10 Distance off course = 200 ft per dot per NM from VOR station. Distance to station = TAS X minutes for bearing change /degrees of bearing change Time to station = Seconds for bearing change /degrees of bearing change Standard service volumes do not apply to published routes.
Cone of confusion. Reverse sensing.(if used incorrectly) Requires line of site to station. VOR receiver checks: (91.171) Every 30 calendar days. VOT 4 Repair station 4 VOR ground checkpoint 4 VOR airborne checkpoint 6 Dual VOR cross-check 4 Above a prominent ground landmark on a selected radial at least 20 NM from a VOR, flying at a reasonably low altitude 6 VOR check signoff: (91.171) D.E.P.S D- Date E- Error P- Place S- Signature
Airplane IFR quick-review study sheets | page 5 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Distance Measuring Equipment (DME)
962-1213 MHz (UHF). Normally tuned automatically with a paired VHF station (VOR/LOC). The Airborne DME unit transmits an interrogation signal. The ground DME facility receives and replies to the interrogation. The time passed is used by the airborne unit to calculate the slant range distance from the aircraft to the station. Slant range error is negligible at 1 NM from the DME station per every 1000ft.
NDB:
Non-Directional Beacon Operates at the 190-535 kHz range (can receive and point towards commercial radio AM station at 550 -1650 kHz). Low to medium frequency band. ADF (Automatic Direction Finder) in aircraft points towards the NDB station. Magnetic Bearing = Magnetic Heading + Relative Bearing
Glide slope
Frequency range: 329.3 to 335 MHz (UHF) (GS is automatically tuned with localizer frequency). Width: 1.4 degree (full deflection is 0.7 either direction). Range: typically up to 10 NM. Slope: 2.5-3.5. Errors: False glide slope above normal glide slope.
Glide slope
0.7 0.7
10 NM
3
250-650 feet 750-1250 feet
Marker beacons Provides range information over specific points along the approach. Transmits at 75 MHz. Outer marker: 4-7 miles out. Indicate the position at which the aircraft should intercept the GS at the appropriate interception altitude 50ft. BLUE. - - - Middle marker: ~3500ft from the runway. Indicates the approximate point where the GS meets the decision height. Usually 200ft above the touchdown zone elevation. AMBER. . - . - Inner marker: between the MM and runway threshold. Indicates the point where the glide slope meets the DH on a CAT II ILS approach. WHITE. . . . Back course marker: Indicates the FAF on selected back course approaches. Not a part of the ILS approach. WHITE. .. .. Compass locator
Low-power NDB transmitter (at least 25 Watts and 15NM range) installed together with the OM or the MM on some ILS approaches.
ILS Category CAT I CAT II CAT IIIa CAT IIIb CAT IIIc
Approach Light System (ALS) Helps the transition between radio-guided flights into a visual approach. Can help in estimating flight visibility if you know the dimensions of the specific ALS configuration.
DH 200' 100' <100' or no DH <50' or no DH No DH
Airplane IFR quick-review study sheets | page 6 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Rate of decent for a 3 glide slope: ground speed X 5 = vs to maintain; Or, 10 X ground speed / 2 = VS
Example: 120 KT X 5 = 600 fpm or, 10 X 120 KT / 2 = 600 fpm
Convert climb gradient from ft/NM to fpm ft/nm requirement X NM per Minute
Ex.: DP requires 300 ft/NM climb. Your ground speed is 120KT, which is 2NM per minute (120 KT / 60 min = 2 NM per min). 300 x 2 = 600 fpm
Types of altitudes
Indicated altitude Uncorrected altitude indicated on the dial when set to local pressure setting (QNH). Pressure altitude Altitude above the standard 29.92. Hg plane. (QNE) Density altitude pressure alt. corrected for nonstandard temperature. Used for performance calculations. True altitude Actual altitude above Mean Sea Level (MSL). Absolute altitude Height above airport elevation (QFE).
Types of speeds
Indicated airspeed (IAS) indicated on the airspeed indicator Calibrated airspeed (CAS) IAS corrected for instrument & position errors. Equivalent airspeed (EAS) CAS corrected for compressibility error. True airspeed (TAS) Actual speed through the air. EAS corrected for nonstandard temperature and pressure Mach number The ratio of TAS to the local speed of sound. Ground speed Actual speed over the ground. TAS corrected for wind conditions.
Pitot blockage: The only instrument affected is the airspeed indicator. Ram air inlet is clogged and drain hole open Airspeed will drop to zero. Both air inlet and drain hole are clogged The airspeed indicator will act as an altimeter, and will no longer be reliable. When you suspect a pitot blockage, consider the use of pitot heat to melt ice that may have formed in or on the pitot tube.
Airplane IFR quick-review study sheets | page 7 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Basic VFR weather minimums (91.155)
*Min visibility & distance from clouds: 3152 3SM, 1000 above, 500 below, 2000 horizontal. 1152 1SM, 1000 above, 500 below, 2000 horizontal. 5111 5SM, 1000 above, 1000 below, 1SM horizontal. Class A IFR only Class E above 10,000 MSL and class G above 10,000 MSL and 1,200 AGL 5111* 10,000 MSL
Class G above 1200 AGL but below 10,000 MSL Day: 1152*. Night: 3152*
1,200 AGL G below 1200 AGL Day: 1SM clear of clouds Night: 3152* or 1SM clear of clouds if in a traffic pattern within SM from the runway.
Gyroscopic instruments
Two principles of a gyroscope: Rigidity in space and precession. Attitude indicator operates on the principle of rigidity in space. Shows bank and pitch information. Older AIs may have a tumble limit. Should show correct attitude within 5 minutes of turning on the engine. Normally vacuum-driven in GA aircraft, may be electrical in others. May have small acceleration/deceleration errors (accelerate-slight pitch up, deceleratepitch down) and roll-out errors (following a 180 turn shows a slight turn to the opposite direction). Heading indicator operates on the principle of rigidity in space. It only reflects changes in heading, but cannot measure the heading directly. You have to calibrate it with a magnetic compass in order for it to indicate correctly. Some HIs are slaved to a magnetic heading source, such as a flux gate, and sync automatically to the correct heading. Normally powered by the vacuum system in on GA aircraft. Turn indicators operates on the principle of precision. o Turn coordinators show rate-of-turn and rate of roll. o Turn-and-slip indicators show rate-of-turn only.
Generic instrument taxi cockpit check *You should tailor it to your aircraft & operations
Airspeed 0 KIAS. Turn coordinator ball centered and wings level when not turning. On turns: shows turn in correct direction, ball goes to opposite direction of the turn. Attitude Correct pitch attitude and bank angle 5 within 5 minutes. Heading indicator Set and shows correct headings. Altimeter Set to local altimeter settings or field elevation. Shows correct field elevation 75 feet. VSI 0 fpm. Magnetic compass swings freely, full of fluid, shows known headings and deviation card is installed. Marker beacons Tested. NAV & Comm Set. GPS Checked and set. EFIS cockpits Check PFD/MFD/EICAS for Xs, messages and removed symbols.
Airplane IFR quick-review study sheets | page 8 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
En route weather information sources
En route Flight Advisory Service (EFAS) 122.0 MHz at 5,000-17,500 MSL. Other frequencies are available above 18,000. EFAS is called flight watch over
the radio.
Transcribed Weather Broadcast (TWEB) Available in Alaska only. A recorded broadcast over selected L/MF and VOR facilities of weather information for
summary of any AIRMETs, SIGMETs, convective SIGMETs and Center Weather Advisories (CWA) and urgent PIREPs.
DATALINK Displays textual and graphical weather information obtained via ground stations (such as FISDL) or satellites. You should pay attention to
coverage gaps and the age of the information. Automatic Terminal Information Service (ATIS) Automated Surface Observation System (ASOS) Automated Weather Observation System (AWOS) ATC - Center weather advisories are issued by ARTCC to alert pilots of existing or anticipated adverse weather conditions. ARTCC will also broadcast severe forecast alerts (AWW), convective SIGMETs and SIGMETs on all of its frequencies except for the emergency frequency (121.5 MHz). Onboard weather radar Onboard lightning detector
Convective SIGMET (WST) - An inflight advisory of convective weather significant to all aircraft. Issued hourly at 55 minutes past the hour. Valid for 2 hours. Contains either an observation and a forecast or only a forecast. Convective SIGMETs are issued for any of the following: o Severe thunderstorms due to: i. Surface winds greater or equal to 50 knots ii. Hail at the surface greater than 3/4 inch in diameter o Tornadoes o Embedded thunderstorms o A line of thunderstorms at least 60 miles long affecting 40% of its length o Thunderstorms producing heavy or greater precipitation affecting more than 40% of an area of at least 3000 square miles. o Convective SIGMETs always implies severe or greater turbulence, severe icing, or low level wind shear. SIGMET (WS) A non-scheduled inflight advisory with a maximum forecast period of 4 hours. Advises of non-convective weather potentially hazardous to all types of aircraft. A SIGMET is issued when the following is expected to occur: o Severe icing not associated with thunderstorms o Severe or extreme turbulence or Clear Air Turbulence (CAT) not associated with thunderstorms. o Dust storms, sandstorms lowering surface visibility below 3 miles. o Volcanic ash AIRMET (WA)- An advisory of significant weather phenomena at lower intensities than those which require the issuance of SIGMETs. These weather conditions can affect all aircraft but are potentially hazardous to aircraft with limited capability. Valid for 6 hours. o AIRMET (T) - describes moderate turbulence, sustained surface winds of 30 knots or greater, and/or non-convective low-level wind shear. o AIRMET (Z) - describes moderate icing and provides freezing level heights. o AIRMET (S) - describes IFR conditions and/or extensive mountain obscurations. o Graphical AIRMETs (AIRMET G) found at http:// aviationweather.gov PIREP (UA) & Urgent PIREP (UUA) pilot weather reports. METAR Aviation routine weather show surface weather observations in a standard international format. Scheduled METARs are published every hour. Nonscheduled METARS (SPECI) are issued when there is a significant change in one or more reported element since the last scheduled METAR. TAF Terminal Aerodrome Forecast. Weather forecast for 5SM radius area around the station. Issued 4 times a day, every six hours and normally cover a 24 or 30 hour forecast period. TAF amendments (TAF AMD) supersede the previous TAF. Aviation Area Forecast (FA) - A forecast of weather condition over an area of several states. When there isn't a TAF available for your route, check the FAs together with SIGMETs, AIRMETs and other information. Area forecasts are issued 3 times a day (or 4 times for the Caribbean, Alaska and Hawaii regions). Surface analysis chart Generated from surface station reports. Shows pressure systems, isobars, fronts, airmass boundaries (such as: drylines and outflow boundaries) and station information (such as: wind, temperature/dew point, sky coverage, and precipitation). Issued every 3 hours. (Hawaii, tropical and Oceanic regions every 6 hours) Weather depiction chart - Just like the surface analysis chart, it is generated from surface station observations. Depicts areas of VFR (at least 3000 ceiling and 5SM visibility), Marginal VFR (1000-3000 ceiling and/or 3-5SM visibility, shown as contoured areas) and IFR (less than 1000 ceiling and/or 3SM visibility, shown as shaded areas). It also shows basic METAR information at selected stations (visibility, sky coverage, ceilings and obstructions to visibility). Issued every 3 hours, starting at 01:00Z. Radar summary chart (SD) Depicts precipitation type, intensity, coverage, movement, echoes, and maximum tops. Issued hourly Wind & temp aloft forecasts (FB) Issued 4 times daily for different altitudes and flight levels. Winds within 1500 AGL and temperatures within 2500 AGL are not shown. Format: DDfftt where DD=wind direction; ff=wind speed tt=temperature. Light and variable winds: 9900. Winds between 100-199 Kt are coded by adding 5 to the first digit of the wind direction. Examples:1312+05 = winds 130 at 12 kt temperature =5 C. 7525-02 = winds 250 at 122 kt temperature -02 C. Above FL240 temperatures are negative and the minus sign (-) is omitted. Low level significant weather chart Forecasts significant weather conditions for a 12 and 24 hour period from the surface to 400 mb level (24,000 ft). Issued 4 times a day. Depicts weather categories (IFR, MVFR and VFR), turbulence and freezing levels. Mid-level significant weather chart Depict forecasts of significant weather at various altitudes and flight levels from 10,000 MSL.to FL450. Shows: thunderstorms, jet streams, tropopause height, tropical cyclones, moderate and severe icing conditions, moderate or severe turbulence, cloud coverage and type, volcanic ash and areas of released radioactive materials. Issued 4 times a day for the North Atlantic Region. High-level significant weather charts Depicts forecasts of significant weather phenomena for FL250 to FL630. Shows: coverage bases and tops of thunderstorms and CB clouds, moderate and severe turbulence, jet streams, tropopause heights, tropical cyclones, severe squall lines, volcanic eruption sites, widespread sand and dust storms. Issued 4 times a day. Convective outlook (AC) Available in both graphical and textual format. A 3-day forecast of convective activity. Convective areas are classified as slight (SLGT), moderate (MDT), and high (HIGH) risk for severe thunderstorms. Issuance: day 1 5 times a day, day 2 twice a day, day 3 once a day.
Airplane IFR quick-review study sheets | page 9 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011
.com
Conditions necessary for the formation of thunderstorms 1. Sufficient water vapor (humidity) 2. An unstable temperature lapse rate 3. An initial uplifting force (such as: front passage, mountains, heating from below, etc.) Thunderstorm hazards - Limited visibility, wind shear, strong updrafts and downdrafts, icing, hailstones, heavy rain, severe turbulence, lightning strikes and tornadoes. Life cycle of a thunderstorm Cumulus stage (3-5 mile height) lifting action of the air begins. Growth rate may exceed 3000 fpm. Mature stage (5-10 miles height) begins when precipitation has become to fall from the cloud base. Updraft at this stage may exceed 6000 fpm. Downdrafts may exceed 2500 fpm. All thunderstorm hazards are at their greatest intensity at the mature stage. Dissipating stage (5-7 miles height) characterized by strong downdrafts and the cell is dying rapidly. Fog A cloud that begins within 50 ft of the surface. Occurs when the air temperature near the ground reaches its dew point, or when the dew point is raised to the existing temperature by added moisture to the air. Radiation fog Occurs at calm clear nights when the ground cools rapidly due to the release of ground radiation. Advection fog warm, moist air moves over a cold surface. Winds are required for advection fog to form. Ice fog Forms when the temperature is much below freezing and water vapor turns directly into ice crystals. Common in the arctic regions but also occurs in mid-latitudes. Upslope fog moist, stable air is forced up a terrain slope and cooled down to its dew point by adiabatic cooling. Steam fog Cold, dry air moves over warm water. Moisture is added to the airmass and steam fog forms. Icing (AC 91-74, AC 00-6A) Structural ice Two conditions for formation: 1.Visible moisture (clouds, fog, precipitation) 2. Aircraft surface temperature below freezing. o Clear ice most dangerous type. Heavy, hard and difficult to remove. Forms when water drops freeze slowly as a smooth sheet of solid ice. Usually occurs at temperatures close to the freezing point (-10 to 0 C) by large supercooled drops of water o Rime ice Opaque, white, rough ice formed by small supercooled water drops freezing quickly. Occurs at lower temperatures then clear ice does. o Mixed ice Clear and rime ice formed simultaneously. Instrument ice structural ice forming over aircraft instruments and sensors, such as pitot and static. Induction ice ice reducing the amount of air for the engine intake. o Intake ice Blocks the engine intake. o Carburetor ice May form due to the steep temperature drop in the carburetor venturi. Typical conditions are outside air temperatures of -7 to 21 C and a high relative humidity (above 80%). Frost Ice crystals caused by sublimation when both the temperature and the dew point are below freezing. Hypoxia insufficient supply of oxygen to the body cells. Hypoxic hypoxia insufficient supply of O2 to the body as a whole. As altitude increases, O2 percentage of the atmosphere is constant, but its pressure decreases. The reduced pressure becomes insufficient for the O2 molecules to pass through the respiratory systems membranes. Hypemic hypoxia Inability of the blood to carry the O2 molecules. It may be a result of insufficient blood (bleeding or blood donation), anemia, or CO poisoning. Histotoxic hypoxia Inability of the body cells to affectively use the O2 supplied by the blood. This can be caused by use of alcohol or drugs. Stagnant hypoxia - Caused by the blood not flowing to a body tissue. Can be caused by heart problems, excessive acceleration (Gs), shock or a constricted blood vessel. Oxygen requirements (91.211) Note: O2 requirements below are for operations under part 91. Part 121 and 135 requirements are different. Cabin pressure altitudes 12,500-14,000ft - crew must use supplemental O2 for periods of flight over 30 minutes at these altitudes. Cabin pressure altitudes above 14,000ft crew must be provided with and use supplemental O2 the entire flight time at these altitudes. Cabin pressure altitudes above 15,000ft each occupant must be provided with supplemental O2. Pressurized cabins o Above FL250 - an addition of at least 10 minutes of supplemental O2 for each occupant is required. o Above FL350 - one pilot at the controls must wear and use an O2 mask unless two pilots are at the control with quick-donning masks and the aircraft is at or below FL410. o If one pilot leaves the controls above FL350, the other pilot must wear and use his O2 mask regardless if its a quick donning type. Hyperventilation A condition which occurs when excessive amount of is eliminated from the body as a result breathing too rapidly. Symptoms may be similar to those of hypoxia. Breathing into a paper bag or talking aloud helps recovery from hyperventilation. Decompression sickness Inert gasses (mainly nitrogen) are released rapidly from solution in the body tissues and fluids as a result of low barometric pressure. The gasses form bubbles that may harm the body in several ways. The most common result of decompression sickness is joint pain (the bends) but it can damage other important tissues, including the brain. Decompression sickness is more likely after scuba diving, where the body is subject to higher pressures. Wait at least 12 hours after scuba diving if your flight is up to 8000ft cabin altitude, or 24 hours for higher cabin altitudes.
You MAY redistribute and share this report (as long as you make no changes and credit pilotscafe.com as the source) All rights reserved to Amir Fleminger and pilotscafe.com. Disclaimer: While attempts have been made to verify the accuracy of the information in this report, the author does not assume any responsibilities or liabilities for errors contained in it or for misuse of this information. You may only use this report at your own risk.
Airplane IFR quick-review study sheets | page 10 | visit pilotscafe.com for more cool stuff
V1.4 copyright 2011