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Pumps are not operational — Proceed with step 4.
3. XFEED switch — CLOSED.
4. FUEL PUMP switches — OFF (inoperative
pump(s).
9-1-53. Fuel Low Caution.
If the FUEL LOW and FUEL PRESS cautions come on
perform the following:
1. Fuel quantity — Check individual tanks.
2. XFEED switch — As required.
3. Land as soon as practicable.
TM 1-1520-240-10
9-1-24
9-1-54. FUEL LOW and FUEL PRESS Cautions.
If the FUEL LOW and FUEL PRESS cautions come on
perform the following:
WARNING
Failure of main tank fuel boost pumps with
the crossfeed open and a fuel low condition
may result in a dual engine flameout.
Nose low attitude should be avoided.
1. XFEED — CLOSED.
2. Land as soon as possible.
9-1-55. Electrical System.
9-1-56. NO. 1 or NO. 2 GEN OFF Caution.
NOTE
If either an AC or DC system fails with no bus
tie, the hydraulic oil cooler fans will not function.
If any other system caution comes on or a system is lost,
a bus tie does not exist. The primary caution segment
lights to look for in determining whether or not a bus tie
exists are L and R FUEL PRESS NO. 1 and NO. 2 RECT
OFF, and NO. 1 and NO. 2 AFCS OFF.
If no bus tie exists and the failed generator cannot be
restored:
Land as soon as possible.
If only the NO. 1 or NO. 2 GEN OFF caution is illuminated,
a bus tie exists.
1. GEN switch — OFF RESET, then ON.
If the caution remains on:
2. GEN switch — OFF.
3. Land as soon as practible.
9-1-57. NO. 1 and NO. 2 GEN OFF Cautions.
Should both generators fail, both transformer-rectifiers
will also be disabled. This condition will be indicated by
loss of both AFCS (which can result in abrupt attitude
changes) the lighting of both AFCS, OFF, GEN OFF, and
RECT OFF caution. Since there will be a loss all primary
attitude, instrument, navigation and stabilization systems,
the primary concern is to land as soon as possible
and the secondary concern is to restore electrical power.
The only electrical power available will be 24-volt DC
from the battery.
CAUTION
If both generators fail, the main tank boost
pumps will be inoperative. If flight is conducted
above 6,000 feet PA, descend below
6,000 feet PA as soon as possible to
avoid a dual engine flameout. If applicable,
reduce airspeed to 100 KIAS or Vne,
whichever is slower. 712 Also all normal
beep trim functions will be inoperative.
The control of engine RPM will be accomplished
via the EMER ENG TRIM 1 and 2
switches. LCT and DASH actuators will
remain programmed at the airspeed at
which the generators failed.
1. Land as soon as possible.
2. 712 EMER ENG Trim — Adjust.
If unable to land proceed as follows:
1. Airspeed — below 100 KIAS.
2. Altitude — below 6,000 feet PA.
3. AFCS — OFF.
4. PDPs — Check circuit breakers and place
gang bars down.
5. Each GEN switch — OFF RESET, then ON.
Electrical power is restored (from either generator):
Land as soon as possible
Electrical power is not restored.
1. APU — Start.
2. APU GEN — ON.
3. Land as soon as possible.
9-1-58. No. 1 or No. 2 RECT OFF Caution.
NOTE
If a DC bus-tie does not occur (No. 2 Rect Off),
power to open the cargo hooks in normal
mode is not available and the associated hydraulic
cooler fan will not function. Other cautions
will be on, such as L FUEL PRESS (if
crossfeed valves are closed).
DC bus tie has not occurred:
Land as soon as possible.
DC bus tie has occurred (only the RECT OFF caution will
be on):
1. PDP’s —Check.
2. Land as soon as practicable.
TM 1-1520-240-10
9-1-25
9-1-59. NO.1 and NO. 2 RECT OFF Cautions.
When both transformer-rectifiers (TR) fail, all equipment
on the No. 1 and No. 2 DC buses will be disabled. Equipment
which will be lost includes all fuel boost pumps, both
AFCS, accompanied by abrupt attitude change, and both
torque indicators. 712 Normal Engine beep trim is also
disabled, therefore changes in power settings should be
minimized. The only source of DC power is the battery.
CAUTION
If both transformer rectifiers have failed, the
main tank boost pumps will be inoperative. If
flight is conducted above 6,000 feet PA, a
descent below 6,000 feet PA must be initiated
as soon as possible to avoid a dual engine
flameout. If applicable, airspeed should be
reduced to 100 KIAS or Vne, whichever is
slower. LCT and DASH actuators will remain
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