adjustment screw. 3) If the APU speed is too low, turn the governor adjustment screw clockwise. 4) If the APU speed is too high, turn the governor adjustment screw
counterclockwise.
5) Tighten the locknut on the governor adjustment screw.

(g)  APUs WITH 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) Use the screwdriver and wrench assembly to loosen the locknut on the governor
adjustment screw. 2) If the APU speed is too low, turn the governor adjustment screw clockwise. 3) If the APU speed is too high, turn the governor adjustment screw
counterclockwise.
4) Tighten the locknut on the governor adjustment screw.

(h)  
APUs WITHOUT ALLIED SIGNAL SB GTCP85-49-7096 AND FUEL CONTROL UNIT WITH 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 jamnut wrench to loosen the jamnut on the governor adjustment nut. 3) If the APU speed is too low, turn the governor adjustment nut clockwise with the

adjuster wrench. 4) If the APU speed is too high, turn the governor adjustment nut counterclockwise with the adjuster wrench. 5) Tighten the jamnut on the governor adjustment nut.

(i)  
APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096 AND FUEL CONTROL UNIT WITH 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) Use the jamnut wrench to loosen the jamnut on the governor adjustment nut. 2) If the APU speed is too low, turn the governor adjustment nut clockwise with the

adjuster wrench. 3) If the APU speed is too high, turn the governor adjustment nut counterclockwise with the adjuster wrench. 4) Tighten the jamnut on the governor adjustment nut.

(j)  
On forward overhead panel, position APU master switch to OFF.

(k)  
Do the above test steps again until the governor speed adjustment is correct.

(l)  
Open circuit breaker on face of APU control unit (located in electrical and electronic bay) and placard.

519 
Aug 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-21-01 Page 510A 

(5)  
Disconnect gas turbine engine tester from engine (Fig. 502).

(a)  
Check that BATTERY switch is OFF and placard.

(b)  
Repeat steps 2.A.(6)(h) thru 2.A.(6)(n).

(6)  
Restore airplane to normal configuration.

519 
49-21-01 Page 510B  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/95 

(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.
(b)  
Disengage APU compartment access door support rods and stow rods. Close and latch access door.

(c)  
Position BATTERY switch to ON and remove placard.

C.  Fuel Control Unit Acceleration Limiter Valve Cracking Pressure (Opening) Test
NOTE:  It is not necessary to do the cracking pressure (opening) test for the acceleration limiter valve on the fuel control unit after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting or cracking pressure (opening) adjustment of the fuel control unit.
Prior to performing fuel control unit acceleration limiter valve cracking pressure test, operate APU at no-load condition for approximately 5 minutes. This will ensure that fuel is available to the APU, and, in the event the fuel control unit was changed, will remove preservative oil from the fuel control unit.
(1)  
Equipment and Materials

(a)  Pressure Gage and Case Set - No. 282645, AlliedSignal, Inc., Airline Services Division, P.O. Box 52170, Phoenix, AZ 85072-2170

(2)  
Prepare for fuel control unit acceleration limiter valve cracking pressure test (Fig. 503).

(a)  
Position BATTERY switch to OFF and placard.

(b)  
Open all fuel system boost pump circuit breakers, including APU dc boost pump (where applicable) on aft overhead panels P6-3 and P6-5.

(c)  
Open APU compartment access door latches and open door. Install door support rods.

(d)  
Support lower shroud, open shroud latches, and remove shroud.

CAUTION:  EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
　
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