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Bleed air leaks in the engine compartment
illuminate the appropriate FIRE warning light, and
FIRE light proceduresa pply. Bleed air leaks outsidet he
engine compartment illuminate the BLEED DUCT caution
light. Hot air leaks also illuminate the BLEED
DUCT caution light. Illumination of the appropriate
caution/warning light should he the first indication ofan
ECS leak. ECS turbine failures can cause hot air leaks.
After a compressor-side failure, catastrophic thermal
damagec an be causedb y heatg eneratedd uring turbine
winddown. Wire bundles, flight control rods, and
SMDC lines are in the vicinity of the ECS turbine and
hot air manifold. Both turbine and compressor-sidefa ilures
may cause a whining noise emanating from below
and behind the right side of the RIO cockpit, and other
indications of an ECS air leak follow.
NAVAIR Ol-Fl4AAD-1
If warning or caution systems do not function, the
first indication of an ECS leak can vary. The presence
and order of appearanceo f indications depend on the
size and location of the leak.
Direct and indirect indications are listed below in a
representativeo rder of appearanceh; owever, they can
appeari n any sequenceT. he presenceo f any one direct
indicationorany two indirect indicationsshall be treated
as an ECS leak.
Direct indications:
1. BLEED DUCT caution light
2. FIRE warning light
3. Smoke or fumes in the cockpit
4. Heat emanating from behind aft right comer of
RIO cockpit
5. Complete loss of ECS airflow.
Indirect indications:
6. Audible pop or squeal from ECS
7. Rapid drop in cockpit airflow
8. Electrical tire indications
9. Any ECS advisory light (SENSOR COND or
COOLING AIR).
When an ECS duct leak is indicated or ECS turbine
whine is heard, AIR SOURCE should be immediately
selected OFF. ECS leaks may melt wiring splice junctions
and create conditions that may induce an electrical
tire. Ifan associatede lectricalt ireoccurs, smoke,f umes,
heat, and damage to the surrounding aircraft structure
may intensify. Since electrical fire procedures are not
compatible with measures to eliminate smoke and
fumes, canopyj ettison may become necessarya s a lastditch
procedure.
(WARNING1
Failure to immediately select AIR SOURCE
OFF upon indication of an ECS leak may
result in severe aircraft damage and loss of
aircraft.
_-------
14-25 ORIGINAL
---- _------------a,\\\\\\\
m
NAVAIR 0%Fl4AAD-1
I
1 WARNING 1
Selection of AIR SOURCE to RAM alloys
bleed air to circulate throughout the 400 “F
manifold system.
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 remainiig.
Note
When ECS service air to the OBOGS concentrator
is shut off, the aircrew has approximately
30 seconds before depleting
residual OBOGS pressure and mask collapse.
Restoration of service air (selecting
RAM) will return OBOGS to operation.
* 1. AIR SOURCE pushbutton - OFF.
*2. OBOGS master switch-BACKUP.
Oxygen breathing time on BACKUP is limited
and requires immediate mission planning.
See OBOGS emergency procedure.
See Figure 2-8 1 for oxygen breathing time
remaining.
Note
l When ECS service air to the OBOGS
concentrator is shut off, the aircrew has
approximately 30 seconds before depleting
residual OBOGS pressure and mask
collapse.
l Restoration of service air (selecting
RAM) will return OBOGS to operation.
*3. If smoke or fumes are present:
a. Altitude - Below 35,000 Feet.
b. CABIN PRESS switch -DUMP.
*4. RAM AIR switch -OPEN.
Note
Ram air door may take up to 50 seconds to
fully open.
5. Airspeed-Below 300 knots/O.8 Mach.
6. Nonessential electrical equipment-Secure.
7. CANOPY DEFOG/CABIN AIR lever - CANOPY
DEFOG.
8. Land as soon as possible.
If electrical tire:
9. Follow Electrical Fire proceduresp, aragraph1 4.7.5.
m
The EMERG generator switch should be let?
in NORM unless there are overriding considerations
that mandate turning the emergency
generator off.
Note
a Selecting AlR SOURCE OFF eliminates
pressurizationt o the service system( canopy,
g-suit, external fuel tanks, pressure/
ventilation suit, and airbag seals). Rain mmoval,
defog, OBOGS, and heating systems
are also eliminated. Judicious
reselectiono f AIR SOURCE to BOTH or
RAM to regainc ritical SupporVsetvicsey stems
is predicatedo n severityo f ECS malfunction
　
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