(g)
Install cap on fuel pressure port (43) and on tester coupling (3).
(h)
Disconnect the electrical cable or test cable assembly (46) from tester and from engine.
(i)
Disconnect the leads of the electrical cable or test cable assembly (46) from the terminals of the EGT thermocouple probe.
(j)
Connect the leads of the thermocouple harness to the terminals of the EGT thermocouple probe.
(k)
Connect APU harness (47) electrical plug to receptacle in upper shroud.
(l)
Disconnect the electrical cable or test cable assembly (46) from electronic speed switch (44) and electronic speed switch harness connector (45).
(m)
Connect electrical plug D1245 (45) to electronic speed switch (44).
(n)
Connect the electrical plug (37) to the tachometer generator (36).
(7)
Restore airplane to normal configuration.
(a) Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
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(b)
Disengage APU compartment access door support rods and stow rods. Close and latch access door.
(c)
Remove placard from BATTERY SWITCH.
B. Fuel Control Unit Governor Speed Setting Test
NOTE: It is not necessary to do the governor speed setting test for the fuel control unit after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting and governor speed adjustment of the fuel control unit.
(1)
Equipment and Materials
(a)
Gas Turbine Engine Tester - No. 290270-2-1, AlliedSignal, Inc., Airline Services Division, P.O. Box 52170, Phoenix, AZ 85072-2170
(b)
Electrical Cable Assembly - No. 834367-1, AlliedSignal, Inc.
(c)
Test Cable Assembly - No. 294110-1, AlliedSignal, Inc. (this is an alternative to the 834367-1 Electrical Cable Assembly)
(d)
Adapter Cable Assembly - No. 2024498-1, AlliedSignal, Inc. (this is an alternative to the 834367-1 Electrical Cable Assembly)
(e)
FUEL CONTROL UNIT WITHOUT THE TIMED ACCELERATION CONTROL; Screwdriver and Wrench Assembly - No. 280353, AlliedSignal, Inc.
(f)
FUEL CONTROL UNIT WITH THE TIMED ACCELERATION CONTROL; Jamnut Wrench - No. 833275-1, AlliedSignal, Inc.
(g)
FUEL CONTROL UNIT WITH THE TIMED ACCELERATION CONTROL; Adjuster Wrench - No. 833274-1, AlliedSignal, Inc.
(2)
Prepare for fuel control unit governor speed setting test.
(a)
Position BATTERY SWITCH to OFF and placard.
(b)
Open APU compartment access door latches and open door. Install door support rods.
(c)
Support lower shroud, open shroud latches, and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
(3) Connect gas turbine engine tester to engine.
(a)
Repeat steps 2.A.(3)(a) thru 2.A.(3)(g).
(b)
Disconnect the electrical plug (37) from the tachometer generator (36).
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(c) Connect the electrical cable or test cable assembly (46) to the tachometer generator
(36) and the electrical plug (37).
(4) Test fuel control unit governor speed setting.
(a)
Perform prestart procedure per par. 2.A.(4).
(b)
Observe engine operating precautionary requirements given in par. 1.D. while performing test.
(c)
On forward overhead panel, position APU master switch to START and release.
NOTE: If APU master switch is positioned initially to ON and air inlet door fully opens before APU master switch is moved to START, CLOSE coil of start and stop relay K1 will not be energized and engine will not start.
(d)
Allow engine to accelerate to service speed.
(e)
With no load applied, engine speed should stabilize at 102.5% rpm (max) as indicated on indicator (15) (Fig. 502).
(f)
APUs WITHOUT ALLIED SIGNAL SB GTCP85-49-7096 AND FUEL CONTROL UNIT WITHOUT THE TIMED ACCELERATION CONTROL; if the stable APU speed is not between 101.3-102.5% rpm, adjust the governor for the fuel control unit: 1) Do the APU normal shutdown (AMM 49-11-0/201). 2) Use the screwdriver and wrench assembly to loosen the locknut on the governor
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