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* * * *
IF Flight Is One Hour Or Longer:
Use Normal Procedures except as modified below:
Prior to Takeoff:
LAND ALT and CAB ALT (If Installed) ..........................SET
Set both LAND ALT and CAB ALT (if installed) to 6000 feet or
value indicated by the Cabin / Flight Altitude Placard
(whichever is higher).
Prior to Landing:
At initial descent or approximately 30 minutes prior to landing:
LAND ALT Selector................................................RESET
Reset LAND ALT to the destination airport elevation.
CAB ALT Selector (If Installed)............................RESET
Reset CAB ALT to the destination airport elevation minus
200 feet.
* * * *
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 5
Rev. 11/15/02 #41
BLEED TRIP DURING NO ENGINE BLEED TAKEOFF
Illumination of the BLEED TRIP OFF light during a no engine bleed takeoff occurs
because a relief valve built into the pneumatic system to limit duct pressure does
not have enough flow capacity to limit pressure in the duct below the
overpressure switch activation point. The bleed system can be reset if duct
pressure falls below the overpressure point.
Trip Reset Button ...................................................................................PRESS
System may reset if duct pressure fluctuates to a value below the
overpressure switch activation point.
IF BLEED TRIP OFF Light Extinguishes:
Proceed normally.
* * * *
IF BLEED TRIP OFF Light Remains Illuminated (after 30 sec cooling time):
Accomplish the following at a minimum of 1,500 feet AGL or when
obstacle clearance height has been attained and TAT is 38°C (100°F) or
below:
Engine Anti-Ice Switch(s) (Affected Side)..........................................ON
Reduces the duct pressure.
Trip Reset Button............................................................................PRESS
The system will reset if the duct overpressure reduced below the
overpressure point.
Cabin Pressurization System.......................................RECONFIGURE
Reset the cabin pressure system to a normal engine bleeds on
configuration.
Engine Anti-Ice Switch(s)...............................................AS REQUIRED
Turn engine anti-ice switch(s) off unless in visible moisture and TAT
is 10°C or below.
IF BLEED TRIP OFF Light Remains Illuminated And Wing Anti-Ice Is Required:
Pack Switch (Affected Side) ...............................................................OFF
The pack switch is used to open the isolation valve. Two pack
operation with one engine bleed is not recommended.
* * * *
OR
AIR SYSTEMS
Sec. 2.2 Page 6
Rev. 11/15/02 #41
Continental
737
Flight Manual
BLEED TRIP OFF
The BLEED TRIP OFF light illuminated indicates that the engine bleed air
temperature or pressure is excessive and the bleed air valve has closed
automatically. Loss of bleed air causes the respective pack valve to close and
the mix valves to drive to full cold.
Trip Reset Button ...................................................................................PRESS
The system may be reset when the bleed air has cooled. The BLEED TRIP OFF
light extinguishes if bleed air temperature has cooled below limits. Allow
cooling period of 30 seconds.
Note: At high thrust levels, light may not reset. When altitude and
airspeed permit, a reduction in thrust may allow a reset.
IF BLEED TRIP OFF Light Extinguishes:
Proceed normally.
* * * *
IF BLEED TRIP OFF Light Remains Illuminated:
Pack Switch (Affected Side) .......................................................OFF
Two pack operation with one engine bleed is not recommended.
* * * *
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 7
Rev. 11/15/02 #41
CABIN ALTITUDE WARNING OR RAPID
DECOMPRESSION / EMERGENCY DESCENT
The cabin altitude warning horn alerts the crew when the cabin altitude exceeds
10,000 feet. A rapid loss of cabin pressure, or control of pressurization, at
flight altitudes above 14,000 feet MSL can quickly lead to a situation requiring
an immediate descent to a safe cabin altitude. Such pressurization problems are
evidenced by the cabin rate of climb and altitude indicators, and prolonged ear
distress.
IMMEDIATE ACTION
Oxygen Masks & Regulators........................................................ON, 100%
Crew Communications .............................................................ESTABLISH
No Smoke & Seat Belt Signs .....................................................................ON
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