AFI 11-2C-130v3 - BITS

182 AFI11-2C-130V3 23 APRIL 2012
12.10.3.18.1.4. Remove APU fuel shutoff valve cannon plug and secure.
12.10.3.18.1.5. Manually open the APU fuel shutoff valve.
12.10.3.18.1.6. Reinstall the number 2 dry bay panel.
12.10.3.18.2. Attempt to start APU.
12.10.3.18.3. If APU fails to start, swap the APU fuel control solenoid operated
shutoff valve with the overspeed test solenoid located on the air shroud. Look on the
inboard side of the APU behind and above the oil cooler (see Figure 12.5). NOTE:
To shut down the APU, the fire handle must be pulled.
12.10.3.19. APU Will Not Stay Running – After On Speed
12.10.3.19.1. Disconnect forward bleed air pressure line from overspeed test solenoid
valve, and plug with a number 4 plug (see Figure 12.5).
12.10.3.19.2. Start APU. If APU continues to run, the overspeed test solenoid is bad.
NOTE: To shut down APU, the fire handle must be pulled. NOTE: Reset fire
handle after rotation stops to prevent aircraft battery drain. NOTE: The APU is
protected from overspeed by the mechanical flyweight system in the centrifugal speed
switch assembly.
12.10.3.20. Leaking Brake
12.10.3.20.1. Disconnect brake lines from both sides of the brake shuttle valve.
12.10.3.20.2. Use plugs and caps from the HERK to seal the brake lines and shuttle
valve.
12.10.3.20.3. Secure disconnected hose ends to prevent interference with landing
gear movement during retraction and extension. NOTE: Both landing and takeoff
performance calculations will be affected by a disconnected brake. Use RCR of 5
for all performance calculations.
12.10.3.21. Moving an Aircraft with Flat Main Landing Gear Tire. WARNING:
Use this procedure only as a last resort to move an aircraft out of a hostile environment.
Reduce aircraft weight as much as possible by unloading cargo, defueling, or burning off
fuel. Some fuel may be transferred out of the wing corresponding to the flat tire and into
the opposite wing. Be aware of wing tip and propeller ground clearance.
12.10.3.21.1. Install main gear towing/jacking fitting on the strut with the flat tire.
12.10.3.21.2. Install a 10,000 lb. chain around the top of the strut with the flat tire.
12.10.3.21.3. Connect a tiedown device to the towing fitting. Connect the chain to
the device and tighten.
12.10.3.21.4. Open the Schrader valve at the top end of the MLG strut and bleed all
air pressure from the strut. WARNING: Do not open Schrader valve more than ¾
of a turn. It may be necessary to use the valve stem to bleed the pressure from the
strut. Do not allow the lower nut to loosen. If the lower nut becomes loose it may
allow the Schrader valve to blow out of the strut body.