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If uncommanded SAS or spoiler inputs are present:
*2. ROLL and PITCH CMPTR AC cb’s -Pull
&Al, LBI).
An electrical tire may affect the CADC and
AICS systems causing random movements
of the wings and ramps.
If conditions permit:
Ground-roll braking is inhibited with LA1
and LB1 cb’s pulled.
83. YAW SAS switch - OFF.
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OBOGS will shut down if all electrical
power is lost. BOS will be activated above
10,000 feet MSL but will not be available
below 10,000 feet MSL.
Oxygen breathing time on BACKUP is limited
and requires immediate mission planning. See
OBOGS emergencyp rocedure.S eeF igure 2-
81 for oxygen breathing time remaining.
4. EMERG generator switch - OFF.
Securing all electrical power while airborne
causes the ECS to go full cold.
If cause of fire can be isolated:
5. Pull cb’s of affected equipment,
6. All generators- NORM.
If cause of tire cannot be isolated:
5. Securea ll unnecessarye quipment,
6. EMERG generator switch - NORM.
7. Land as soon as possible.
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Do not operate engines on the ground without
electrical power. Ground cooling fans are
shut off, causing hot bleed air to cook off oil
and hydrocarbons in the ECS ducting, resulting
in smoke in the cockpit and possible damage
to the ECS turbine compressor.
14.7.6 Total Electrical Failure
1. Descend or climb to known VFR conditions.
Note
The standby attitude gyro is capable of
providing reliable attitude information
(within !?‘) for up to 3 minutes after a
complete loss of power.
Cabin pressure will be lost and ECS will
go full cold.
2. Attempt to contact radar facilities or other aircraA
by handheld survival radio.
3. Make arrested landing as soon as possible.
The following systems are still available:
1. Airspeed indicator
2. Altimeter
3. Cabin pressure altimeter
4. Vertical velocity indicator
5. Arresting hook
6. Standby attitude gyro (3 minutes)
7. Emergency wing sweep
8. Landing gear
9. Main flaps/slats
10. Standby compass
11. Backup oxygen system (above 10,000 feet MSL).
(,,,,,,,I
Ground engine operation without electrical
power supplied by either the generators or
external power may cause 20-mm ammunition
detonation because of excessive heat in
the gun ammunition drum.
OBOGS will shut down if all electrical
power is lost. BOS will be activatedabove
10,000 feet MSL but will not be available
below 10,000 feet MSL.
Oxygen breathing time on BACKUP is
limited and requires immediate mission
planning. See OBOGS emergencyprocedure.
See Figure 2-81 for oxygen breathing
time remaining.
Do not operate engines on the ground
without electrical power. Ground cooling
fans are shut off, causing hot bleed air to
cook off oil and hydrocarbons in the ECS
ducting, resulting in smoke and possible
damage to the ECS turbine compressor.
Note
l Total electrical failure will cause the sump
tank interconnect, engine crossfeed, and
motive flow isolationvalves to close, fully
isolating both tank systems. Wing and external
fuel will transfer into the fuselage.
a Ifpossible, a sectionI FR descents houldb e
conductedto VFR conditionsf or landing.
All other normal system and cockpit cues are not
available.
When all electrical power is shut off, the cockpit
dump valve closes and the environmental control system
supplies only cold air to thecockpit and forcedaircooled
avionics. Pressurization will slowly bleed off. If operational
necessity prohibits immediate descent, maintain
cockpit altitude at the highest practicable level to conserve
BOS. Otherwise, descend to a cabin altitude less
than 10,000 feet. If the system failure occurs in the day
or night VFR environment, immediate return to base and
an emergency landing shall be accomplished. In the day
or night IFR environment, ascend or descend to known
VFR conditions. (Extreme care should be exercised because
of partial panel environment.) Reduce power setting
to maximum endurance. Contact nearest ground
facility by handheld survival radio. Once positive radar
identification is made, follow controllers’ directions to
landing.
14.8 ECS MALFUNCTIONS/FAILURES
14.8.1 ECS Leak/Elimination of Smoke and
Fumes. Bleed air leaks, hot air leaks, and ECS turbine
failures have similar indications and results and shall be
treated as one failure, ECS leaks. All can cause unsurvivahle
damage when not recognized and corrected expeditiously.
　
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