Section 13 - B: Engine Controls & Indications

Section 13 - B
Engine Controls & Indications
Section 13 - B Engine Systems

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General View of Engine Controls & Indications
This section serves just as an overview of the various engine controls and indications and their location
in the cockpit. Each system is covered in more detail later in this chapter.
Start Button Start Button
Number 1 Engine Number 2 Engine

Speed Select Speed Select
34 Alpha Panel
ENGINE 1 OVSPD TEST ENGINE 2
BLEED OVSP 1 FAIL POWER OVSP 2 BLEED

OFFSET NORM TEST OFFSET
GOV GOV
V ON FAIL V ON
1 2
E S1 S2 E
N OFF N
T START OFF
T
Central Warning Panel
ENG CH 1 PWR CAL DIFF NG FIRE 1 FIRE 2
ENG CH 2 THROT ENG P1 ENG P2
FIRE D
Figure 9 – Engine Controls and Indications

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29 30 31 32 29 30 31 32
NG 33 NG 33
25 25
34 1 34
20 RPM tr/mn 20 RPM tr/mn
x100 35 x100 35
10 0 10 0
PWR 1 2 PWR 2
7 7
6 8 6 8
T4 T4
5 9 5 9
3
4 0 4 0
ºCx10 ºCx100
3 1 3 1
2 2
OIL OIL
6 6
10 4 10
4 4
5 ºC bar 5 ºC bar
2 2
0 0
0 0
HUILE HUILE
Figure 10 – Engine Indications
1. Ng Gauge (Gas Generator Speed)

2. Power Loss Indicator Lights
3. T4 Gauge (Temperature of intermediate Turbine)
4. Oil Temperature & Pressure Gauges

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1
1+2
2
1+2
With the rotary test/selector button rotated

anti-clockwise ‘1+ 2’ will be indicated on the
corner of the gauge.
50 60
Number ‘1’ needle will indicate total torque 40
and needle ‘2’ will indicate the torque of the 30
1
number 2 engine. 80
2
20 1+2
90
10 100
1+2 0 110
21 1+
2
%
With the rotary test/selector button rotated
clockwise a cross-hatched indicator will
appear in the corner of the gauge. Torque Gauge
Both needles will now indicate respective

engine torque and be more or less one above
the other.
260 280
240
Shorter needles 1 and 2 indicate the Nf 300
(power turbine speed) of each engine. 220 NR+NF
When both engines are operating 320
normally, they will be coincident with the 200
longer Nr needle. 340
RPM tr/mn
The Nr gauge in the Co-pilots position is 100
of a simpler design and does not have the
Nf needles on it
Nr and Nf Gauge
Figure 11 – Torque & Nr and Nf Indications

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Fuel Flow Controls (Speed Select Levers)
A fuel flow control lever (Speed Select Lever SSL) for each engine is fitted in a quadrant on the upper
panel in the cockpit. Each lever with its respective engine starting button recessed in the handle, is
spring-loaded to the right in the quadrant. A 'teleflex' control fitted to the top of the lever transmits
movement to the rod operating the Fuel Control Unit (FCU) of the engine. A ‘trigger' mechanism allows
additional forward movement of the SSL if required for emergency use. Three micro switches are fitted
to each lever.
The quadrant is 'gated' as shown in Figure 12 below and this determines the 5 settings of the SSL
(Notice that gate (E) is notched). Some positions on the quadrant have two names depending on whether
the SSL is being advanced or retarded.
3
2
+ve Manual -ve Manual
Range Range
Trigger Start Button
Speed
Select
Lever E D C B A
Figure 12 – Throttle Quadrant Gates
Position A Engine Shut-Off Fuel cocks in FCU are closed.
Position B Auto Start/ Ground Idle In this position starting is achieved simply by pressing
the start button and releasing. A cam restricts FCU fuel
flow and starting fuel is supplied by the start servo
valve.
Position C Fast Reduction/Fast Idle Engine can be retarded to this gate without the risk of
engine flame out.
Position D Flight In this position the FCU controls Ng and the collective
lever is the power control.
Position E Manual Governing Range Emergency Positive range. Progressively opens an

emergency fuel cock in the FCU.
The SSL may be moved to any intermediate position between (C) and (D) to manually reduce fuel flow if
necessary. This is the Emergency Negative range.
Note - When in either emergency positive or negative range the engine parameters (T4, Ng, Torque)
must be monitored more closely as the normal protection systems are over-ridden.
There are 3 micro-switches associated with the SSLs. They perform the following functions.
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Micro switch 1 Inhibits warning lights ENG P POWER and DIF NG when SSL is in Gate (A).
Micro switch 2 Ensure Auto start is only possible in Gate (B).
Micro switch 3 Extinguishes the THROT light when both SSLs are in the Flight Gate (D).
If the Auto-Start system fails, starting may be achieved by moving the SSL forward of the Start Gate (B)
and holding the start button in. T4 must be monitored closely. Slight movement of the SSL achieves
control of the T4. When the engine reaches 15,000 Ng the start button must be released.

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Section 13 - B: Engine Controls & Indications

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Section 13 - B: Engine Controls & Indications

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Section 13 - B

Engine Controls & Indications

Section 13 - B Engine Systems

Start Button Start Button

Number 1 Engine Number 2 Engine

BLEED OVSP 1 FAIL POWER OVSP 2 BLEED

Central Warning Panel

ENG CH 1 PWR CAL DIFF NG FIRE 1 FIRE 2

ENG CH 2 THROT ENG P1 ENG P2

Figure 9 – Engine Controls and Indications

Section 13 - B Engine Systems

Figure 10 – Engine Indications

1. Ng Gauge (Gas Generator Speed)

Section 13 - B Engine Systems

With the rotary test/selector button rotated

Both needles will now indicate respective

Figure 11 – Torque & Nr and Nf Indications

Section 13 - B Engine Systems

Trigger Start Button

Figure 12 – Throttle Quadrant Gates

Position A Engine Shut-Off Fuel cocks in FCU are closed.

Position E Manual Governing Range Emergency Positive range. Progressively opens an

Micro switch 2 Ensure Auto start is only possible in Gate (B).

Section 13 - B Engine Systems

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