CAUTION:  ON AIRPLANES WITH DOOR LIMIT STOP, AIR INLET DOOR ACTUATOR CAN BE SERIOUSLY DAMAGED IF AIR INLET DOOR CONTACTS DOOR LIMIT STOP WHILE DOOR IS RETURNING TO THE CLOSED POSITION.
575 
Nov 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-15-0 Page 501 

E80447 C04325 E80552 E80610
APU Air Inlet Adjustment  575 
49-15-0  Figure 501 (Sheet 1)  Feb 01/95 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  APU Air Inlet Adjustment 
Jun 20/93  Figure 501 (Sheet 2)  49-15-0 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

APU Air Inlet Adjustment  575 
49-15-0  Figure 501 (Sheet 3)  Feb 01/95 
Page 504 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

575  APU Air Inlet Adjustment 
Feb 01/95  Figure 501 (Sheet 4)  49-15-0 
Page 505 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(k)  
If required, adjust rod ends until gap between door and inlet throat is as shown in view 2, Fig. 501.

NOTE: Do not adjust beyond limits shown for door open position.

(l)  
Adjust air inlet door switch plunger travel length per par. B.

B.  Air Inlet Door Switch Adjustment
(1)  
Prepare for Air Inlet Door Switch Adjustment

(a)  
Check that BATTERY SWITCH is ON.

(b)  
Position APU master switch to ON.

(c)  
After air inlet door is fully open, position BATTERY SWITCH to OFF and placard.

(d)  
Open stabilizer trim access door 3701 to gain access to air in let door switch.

(2)  
Adjust Air Inlet Door Switch Plunger

(a)  
Disconnect electrical plug from switch (Fig. 501).

(b)  
Remove screws attaching switch baseplate to air diffuser duct and remove switch and plate.

(c)  
Remove nut and lockwasher securing switch to baseplate and remove switch. If replacing switch, remove keying washer and nut.

(d)  
Temporarily assemble switch to baseplate in following sequence: nut, keying washer, baseplate, lockwasher and nut.

(e)  
Insert switch in duct so that plunger is just touching air inlet door. Do not compress plunger.

(f)  
Rotating nuts on switch, adjust location of baseplate so that gap between baseplate and duct is 0.20 to 0.25 inch.

(g)  
Position tab of keying washer on flat of nut and tighten locknut to a torque value of 30-40 pound-inches.

(h)  
Lockwire and seal (See Fig. 501, Sheet 2, Detail C).

(i)  
Position baseplate on air diffuser duct and install attaching screws.

(j)  
Connect electrical plug to switch.

(3)  
Restore Airplane to Normal Configuration

(a)  
Close stabilizer trim access door 3701.

(b)  
Position BATTERY SWITCH to ON and remove placard.

(c)  
Position APU master switch to OFF.

C.  Air Inlet Door Vortex Generator Flap Adjustment.
NOTE:  Air inlet door and door switch adjustment must have been accomplished prior to adjustment of vortex generator flap.
(1)  Prepare for air inlet door vortex generator flap adjustment. 
(a)  
Verify air inlet door in closed position.

(b)  
Check that BATTERY SWITCH is OFF and placard that APU maintenance is “in work.”

(c)  
Open stabilizer trim access door 3701 to gain access to air inlet duct. 

49-15-0  Feb 20/84
Page 506
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(2)  Adjust air inlet door vortex generator flap. 
(a)  
Turn set screw out 3-4 turns

(b)  
Loosen nuts No. 1 and 2 and back them off to clear barrel fitting .

NOTE:  Ensure that nut No. 1 is backed off to end of thread to prevent interference when checking door and flap position.

(c)  
Pull outward on trailing edge to eliminate all looseness on door and flap and to ensure that flap is firmly seated against door closed position stop. Turn nut No. 2 finger-tight against barrel nut.

(d)  
Tighten No. 2 nut an additional 1-1/2 turns.

(e)  
Tighten No. 1 nut firmly against barrel fitting. Lockwire nuts 1 and 2 together.

(f)  
　
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