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Flight Manual
FAILURE OF AIR/GROUND SENSING LOGIC
In the event the ground sensing logic reverts to the air mode while the aircraft is
on the ground or vice versa, the following system malfunctions may occur:
- - - - - AFTER TAKEOFF - - - - -
The landing gear lever will not go above the OFF position.
- - - - - AFTER LANDING - - - - -
· The landing warning horn sounds intermittently and may not be silenced.
· The landing gear unsafe lights flicker.
· The aircraft may not depressurize.
· The APU generator will only power one bus.
· When the brakes are applied with the anti-skid system ON, feedback is felt
in the pedals. Braking is normal with the anti-skid OFF.
Investigation has revealed that the printed circuit (PC) cards located in lower E
and E compartment have had moisture contamination resulting from spilled
fluids leaking through the floor. If one or more cards revert to the air mode
when the aircraft is on the ground, it may result in full or partial loss of braking
at taxi speeds below 15 knots with the anti-skid ON. Braking should be normal
with the anti-skid OFF.
* * * *
737
Flight Manual
Continental
LANDING GEAR
Sec. 2.14 Page 7
Rev. 11/15/02 #41
OR
OR
GEAR LEVER WILL NOT MOVE ABOVE OFF AFTER TAKEOFF
This condition is recognized by the inability to position the landing gear
lever UP in the normal manner. The probable cause is:
· Failure of the air-ground system.
· Failure of the landing gear lever latch solenoid.
· Failure of the ground spoiler bypass valve to close.
· BCD Manual Gear Extension Door is not closed and/or not
connected to solenoid.
· BCD Failure or contamination of solenoid inside of Manual
Gear Extension Door.
Land Gear Lever............................................................................DOWN
IF Takeoff Configuration Warning Is SILENT After The Flaps Are Fully
Retracted:
Note: This condition indicates a failure of the landing gear latch
solenoid.
Landing Gear Override Trigger............................................. PULL
This bypasses the solenoid lever lock.
Landing Gear Lever......................................................... UP & OFF
* * * *
IF Takeoff Configuration Warning SOUNDS After The Flaps Are Fully
Retracted:
Note: This condition indicates a failure of either the air/ground
system or failure of the ground spoiler bypass to close.
Aural Warning C/B (P6-3, D18) .................................................... PULL
IF Practical, Leave Gear Extended And Return To Departure Airport.
A landing at the nearest suitable airport is recommended.
Caution: Do not operate the Speedbrake inflight. A high sink rate
could develop due to ground and flight spoiler
deployment.
* * * *
IF The Flight Must Be Continued:
(Continued)
LANDING GEAR
Sec. 2.14 Page 8
Rev. 11/15/02 #41
Continental 737
Flight Manual
Landing Gear Override Trigger..............................................PULL
This bypasses the solenoid lever lock.
Landing Gear Lever......................................................... UP & OFF
Landing Gear Air/Gnd Relay And Lights C/B
(>>@ P6-3, C-18)(BCD P6-3, D15) ............PULL
Caution: Do not operate the speedbrakes inflight. A high sink rate
could develop due to ground and flight spoiler
deployment.
- - - - - PRIOR TO LANDING - - - - -
Caution: Do not arm speedbrakes
After landing gear extension:
Landing Gear Air/Gnd Relay And Lights C/B
(>>@ P6-3, C-18)(BCD P6-3, D15) .........RESET
Landing Gear...................................................... DOWN, 3 GREEN
Landing Gear Air/Gnd Relay And Lights C/B
(>>@ P6-3, C-18)(BCD P6-3, D15) ............PULL
Pulling the C/B will prevent the takeoff warning horn from
sounding after selecting flaps beyond the takeoff range.
Manually deploy speed brakes upon touchdown.
After landing with the C/B pulled, aircraft systems will be in the AIR
mode. Some of the abnormal system reactions are: locked wheel
protection will not be available and inboard wheel brakes are
inoperative at taxi speeds, the stall warning system may activate
continuously, and the pressurization system will maintain a small
positive pressure.
See FAILURE OF AIR / GROUND SENSING LOGIC, this section.
* * * *
737
Flight Manual
Continental
LANDING GEAR
Sec. 2.14 Page 9
Rev. 11/15/02 #41
OR
MANUAL GEAR EXTENSION
Use this procedure if the landing gear lever is placed in the DOWN position
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