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4. Monitor EGT during start (871°C max transient). FADEC will not prevent hot starts airborne.
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V-15-1 ORIGINAL
Figure 15-1. Spooldown Restart Envelope
Figure 15-2. Windmill Restart Envelope
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V-15-2 ORIGINAL
Figure 15-3. Crossbleed Restart Envelope
Figure 15-4. APU Restart Envelope
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V-15-3 ORIGINAL
15.3 FUSELAGE FUEL LEAK
The possibility of fire is normally of prime concern with any fuel leak; however, with a massive leak,
the fuel loss itself must be dealt with promptly and correctly to ensure that sufficient fuel remains to
return to base. Fuel loss rates can be in excess of 1,000 ppm from failed main fuel lines. Left unchecked,
this leak can rapidly drain external tanks, both transfer tanks, and the feed tank on the leaking side.
Since leaks may occur upstream of the throttle-operated fuel shutoff valve in the fuel control, shutting
down the throttle may not stop the leak. Pressing the corresponding FIRE light closes the feed tank
fuel shutoff valve for that engine and stops fuel flow through the main fuel line.
The pilot may not be able to visually determine which side is leaking. Utilize a wingman, when
available, and check for secondary indications to determine the side of the leak. In addition to the
primary cockpit indications listed in the procedure, the following may also be indications of a fuselage
fuel leak: FUEL LO caution, erratic engine operation at high power settings, abnormal fuel flow
indications.
*1. Afterburners - DESELECT
Afterburner operation with a fuselage fuel leak may result in a fire.
*2. Possible Indications:
· Visual confirmation of fuel leakage
· L or R BOOST LO caution
· FUEL LO caution
· FEED tank fuel quantities
· Engine instruments
*3. Throttle (suspect engine) - OFF
*4. FIRE light suspect engine - PUSH
Securing the good engine may result in flameout of both engines.
If leak continues -
5. FIRE light (suspect engine) - RESET
6. Restart shutdown engine.
7. Throttle (other engine) - OFF
8. FIRE light (other engine) - PUSH
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V-15-4 ORIGINAL
If leak still continues -
9. FIRE light (other engine) - RESET
10. Restart shutdown engine.
11. Land as soon as possible.
12. Make a normal landing with light braking (if possible).
Hook sparks during an arrested landing may ignite streaming fuel.
Excessive brake heating may also provide an ignition source for streaming
fuel.
After landing-
13. Turn aircraft into the wind.
14. Throttles - OFF
15. FIRE lights - PUSH
15.4 HYDRAULIC FAILURES
Hydraulic failures are indicated by the HYD 1A, 1B, 2A, and 2B circuit cautions described in
Chapter 12. The effects of losing one or more HYD circuits can be seen by analyzing the Hydraulic
Flow Diagram shown in figure 15-5. For multiple hydraulic circuit failures, the Hydraulic Subsystems
Malfunction Guide (figure 15-6) shows which flight control surfaces are lost.
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V-15-5 ORIGINAL
Figure 15-5. Hydraulic Flow Diagram (Aircraft on Deck)
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V-15-6 ORIGINAL
Figure 15-6. Hydraulic Subsystems Malfunction Guide
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V-15-7 ORIGINAL
15.5 DOUBLE TRANSFORMER-RECTIFIER FAILURE
Failure of both transformer-rectifiers (TRs) can be recognized by loss of the HUD (but not the other
displays), bleed air including cockpit airflow/pressurization, and other equipment which operates on
the main dc busses. The FCC channels continue to be powered by their respective PMG outputs. The
Essential Bus is powered by the EBB PMGs with the battery charger and the battery as backups. The
BATT SW caution light should therefore be out.
With a dual TR failure, time is not critical, and Essential Bus equipment need not be turned off.
Equipment requiring ac power only will remain operable with a dual TR failure and need not be turned
off to conserve battery power. If the L or R DC FAIL caution lights illuminate, all three 28 volt dc
windings from the corresponding PMG are prevented from supplying FCC CH or Essential Bus backup
power. See the Emergency Power Distribution Charts (figure 15-7) for operative and inoperative
equipment.
1. BATT SW caution light - CONFIRM OUT
2. Emergency Oxygen Green Ring - PULL
3. Maintain altitude below 10,000 feet.
4. Electrical RESET button - PRESS
5. Land as soon as practical.
For landing -
6. Perform Emergency Landing Gear Extension Procedure.
7. Make a short field arrestment (if available).
8. Use emergency brakes with steady brake pressure (do not pump). (Anti-skid is not available)
　
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