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21-31-00
ALL ú ú 03 Page 504 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(b) (c) (d) (e) 1) 6B6, NO. 2 AIR DATA COMPUTER - 2 26VAC 2) 6B7, NO. 2 AIR DATA COMPUTER - 2 ACBEJ 061, 062, 101-112 PRE-SB 21-1118; Close these circuit breakers on the P18 panel: 1) 18A8, NO. 1 AIR DATA COMPUTER - 1 AC 2) 18A9, NO. 1 AIR DATA COMPUTER - 1 (26VAC)Set the L and R PACK switches to OFF.Set the RECIRC FAN switch to OFF.Set the CABIN RATE selector to the position with the triangle.
(f) Set the field barometric correction on the captain's standby altimeter.
(g) Set the CAB ALT to 200 feet less than the field altitude.
NOTE:____ On QFE airplanes, the field altitude is zero feet.
(h) (i) (j) (k) Set the mode selector switch to STBY and make sure the STANDBY light comes on.Set the FLT-GRD switch to GRD.Make sure the outflow valve is open or comes open.Do a check of the flight operation for the standby mode:
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING EDGE SLATS. WHEN RELAYS ON THE LANDING GEAR
GET INPUT OF AN AIRBORNE CONDITION, THE LEADING EDGE SLATS CAN MOVE QUICKLY. YOU MUST PUT THE CONTROL SYSTEM FOR THE LEADING EDGE SLATS IN A DISCONNECTED
CONDITION TO PREVENT ACCIDENTAL MOVEMENT. THE
ACCIDENTAL MOVEMENT OF THE LEADING EDGE SLATS CAN
CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
1) 2) 3) 4) 5) 6) 7) 8) Disconnect the control system for the leading edge slats (AMM 27-81-00/201).Open the LANDING GEAR AIR/GND RELAY & LTS circuit breaker.Look at the VALVE position indicator and make sure the aft outflow valve fully closes in 10 to 40 seconds.Visually make sure that the forward outflow valve closes.Set the FLT-GRD switch to FLT.Close the LANDING GEAR AIR/GND RELAY & LTS circuit breaker.Make sure that the aft outflow valve and the forward outflow valve stay closed.Increase the CAB ALT adjustment to 200 feet more than the field altitude.
9) Make sure the two outflow valves open fully in 10 to 40 seconds.
(l) Do a check of the airplane barometric correction:
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-31-00
ALL ú ú 03 Page 505 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CAUTION: DO NOT OPERATE AT LESS THAN 28.10 INCH HG (952 MB) OR
_______ MORE THAN 31.00 INCH HG (1049 MB). THIS CAN CAUSE A MALFUNCTION OF THE PRESSURIZATION SYSTEM.
1) Set the CAB ALT adjustment to the field altitude (above sea level).
2) Set the barometric correction on the captain's standby altimeter to 0.3 inch Hg (10 mb) more than the field pressure.
3) Make sure that the aft outflow valve closes in 10 to 40 seconds.
4) Set the barometric correction on the captain's standby altimeter to 0.3 inch Hg (10 mb) less than the field pressure.
5) Make sure that the aft outflow valve opens. 6) Set the barometric correction to the field barometric
pressure. 7) Set the mode selector switch to AC MAN. 8) Set the FLT/GRD switch to GRD.
S 715-009
(4) Do a test of the automatic mode:
(a)
Do one of these two steps: 1) Install a vacuum source on the pitot-static system of the airplane.
2) Remove the static sense line from the front of the pressure controller and install a vacuum source.
(b)
Set the mode selector switch to AUTO.
(c)
Make sure that these indicator lights are off:
1) AUTO FAIL
2) STANDBY
3) OFF SCHED DESCENT
4) MANUAL
(d)
Do a check of the ground pressurized and ground not pressurized circuits: 1) Set the FLT-GRD switch to FLT. 2) Look at the VALVE position indicator and make sure the aft
outflow valve closes fully in approximately 30 seconds. 3) Set the FLT-GRD switch to GRD. 4) Look at the VALVE position indicator and make sure the aft
outflow valve opens fully in 30 seconds.
(e) Do a check of the operation of the automatic failure detector: 1) Set the FLT-GRD switch to FLT. 2) Set the mode selector switch to CHECK. 3) Make sure that the AUTO FAIL and the STANDBY lights come
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