Service Bulletin

Power Systems Alert – Compliance Will Enhance Safety

PO Box 273 • Fort Deposit, AL 36032
(334) 227-8306 • (334) 227-8596 Fax Bulletin No. A-107A Issue Date: September 6, 2002
http://www.kellyaerospace.com Technical Content is FAA Approved

SUBJECT: Inspection of Fuel Regulator Shutoff Valve as Used With Kelly Aerospace
Combustion Heaters, Models B1500-B4500
REASON: Fuel Leakage
PART NUMBERS AFFECTED: Part Number Voltage Pressure Setting
14D11 12 volt 7.5
14D11 12 volt 12.0
23D04 12 volt 7.5
23D04 12 volt 12.0
A14D11 24 volt 7.5
A14D11 24 volt 12.0
A23D04 24 volt 7.5
A23D04 24 volt 12.0
B14D11 12 volt 1.0
B23D04 12 volt 1.0
C14D11 24 volt 1.0
C23D04 24 volt 1.0

SUMMARY OF REVISION: This revision of Kelly Aerospace Service Bulletin No A-107 incorporates
modifications to the pressure test procedure described in Sections 3 and
4. Recurrent inspection requirements are added to Section 7. A dark
highlight bar in the left-hand margin denotes change locations.

COMPLIANCE: Within the next 10 hours of operation, inspect the fuel pressure regulator and shut
off valve for signs of fuel leakage as follows.

Part Number

Pressure Setting
Voltage Rating

Date of Manufacture

Figure 1

September 6, 2002 Kelly Aerospace Power Systems Service Bulletin No. A-107A Page 1 of 3
 OVERVIEW:
Kelly Aerospace part number 14D11 and 23D04 series fuel regulator and shutoff valves provide
positive fuel shutoff and regulation of fuel inlet pressure to Kelly Aerospace model B1500-B4500
series combustion heaters as used on both piston powered and turbine powered business aircraft.
These valves operate at inlet pressures of 4-50 psi depending upon installation and regulate fuel
outlet pressure (inlet supply to the heater) to 1.0 psi, 7.5 psi, or 12 psi depending upon application.
Each valve is identified with part number, pressure setting, voltage rating, and date of manufacture
as shown in Figure 1.

Recent field reports have indicated the possibility of fuel seepage at either the diaphragm joint or
threaded mount holes as shown in Figure 2. Within the next 10 hours of operation, inspect the
pressure regulator shut off valve for signs of fuel leakage as follows.

Threaded Mount Holes

Diaphragm Joint

Figure 2

INSTALLATION INSPECTION:
1) Locate the pressure regulator shut off valve in the installation. Refer to the applicable
aircraft maintenance manual for valve location, removal, and installation instructions.
2) Prior to removing the valve from the installation, visually inspect the installed valve for
signs of fuel leakage as described below in Section 5. If signs of fuel leakage are found
replace the valve in accordance with the instruction in Section 6.

PRESSURE TEST FOR LEAKAGE:

3) If the valve was not replaced in the preceding step a bench pressure test must be
conducted. Remove the valve from the installation exercising care to cap mating fuel lines
and valve ports to prevent any leakage in the installation. CAUTION, refer to aircraft
maintenance manual for safety precautions when removing valve.
4) Set up the valve on a test bench and pressure test for leakage as follows.
a. Using a suitable source of fluid pressure, configure the valve for pressure test using
a No. 4 inlet line with a 0-60 psi gage installed in the fuel inlet line. Seal the outlet
port by installing a suitable, 1/8-27 NPTF threaded plug. The outlet port will be
pressurized to the same pressure level as the inlet port during this test.

September 6, 2002 Kelly Aerospace Power Systems Service Bulletin No. A-107A Page 2 of 3
 b. Using mineral spirits or JET-A as the test fluid, pressurize the inlet port of the
regulator valve to 50 psi for 1 minute minimum with the solenoid energized.
Carefully inspect the valve body for signs of fuel leakage giving careful attention to
the diaphragm joint and the threaded mount holes as shown in Figure 2. CAUTION
- prior to test, exercise care to wipe valve body and fittings free of any
residual fluid that may have contacted external surfaces of the valve during
test setup. Leakage may appear as a wetness or seepage at the diaphragm joint
or threaded mount holes. Rotate the valve during pressure test as necessary to fully
inspect all external surfaces.
c. If signs of fuel leakage are found replace the valve using a new valve of appropriate
part number with a manufacture date code of 02/02 or later. Record valve
replacement and Service Bulletin compliance in the logbook.

ALTERNATIVE VISUAL INSPECTION:

NOTE: if appropriate equipment to perform the pressure test is not available, an alternative
visual inspection may be performed as follows.

5) Visually inspect the valve body for signs of fuel stains, paying careful attention to the
diaphragm joint and the threaded mounting holes located in sides of the valve body (see
Figure 2). Fuel leakage in those applications using AVGAS may appear as a greenish
blue stain or residue in the area of the diaphragm joint or threaded mount hole. Fuel
leakage in those applications using JET-A fuel may appear as a wetness or oily residue at
the diaphragm joint or threaded mount hole. Utilize supplemental lighting if needed to
facilitate visual inspection. Visual inspection must include all four sides of the regulator
valve body. If signs of fuel leakage are found replace the valve using a new valve of
appropriate part number with a manufacture date code of 02/02 or later. Record valve
replacement and Service Bulletin compliance in the logbook.

POST INSPECTION:
6) If no signs of fuel stains are found, mark the valve cover with date of inspection
(month/year) using permanent ink and letters .12 - .25" high next to or below the date of
manufacture. For example, a valve inspected in June 2002 should be marked 06/02.
CAUTION, re-install the valve in accordance with the applicable aircraft
maintenance manual exercising care to follow safety precautions. Record Service
Bulletin compliance in the logbook.
7) Subsequent inspections should include a visual inspection of the regulator shut-off valve
as described in Section 5 concurrent with any service or inspection activity performed on
the heater assembly or every 100 hours of service or 24 months which ever occurs first.
If signs of fuel leakage are found replace the valve in accordance with the instructions in
Section 6. The regulator shut-off valve should be replaced at heater assembly TBO or
heater assembly replacement.
8) Contact your local authorized distributor for replacement parts. The Kelly Aerospace
Sales Office may be contacted at 877-359-5355 for identification of the nearest distributor.
9) Contact Kelly Aerospace Technical Department at 334-227-8306 for questions concerning
this Service Bulletin.

September 6, 2002 Kelly Aerospace Power Systems Service Bulletin No. A-107A Page 3 of 3