FLOW LIGHT ON

Note:  FLOW light may come on during unpressurized flight or unpressurized ground operation. This is normal.
Throttles (If At Low Power Setting)........................................ADVANCE

IF Light Remains On And Cabin Continues To Depressurize:
Descend to an altitude where normal pressurization can be maintained.
* * * *
MAINTAINING CABIN DIFFERENTIAL PRESSURE DURING
IDLE DESCENT WITH ONE HIGH PRESSURE BLEED

IF Operating On Both Packs:

PNEU X-FEED Levers...........................................BOTH OPEN

OR
* * * *

IF Operating On One Pack:
Throttle (Engine Supplying Bleed Air).... SLOWLY ADVANCE
Slowly advance throttle until AIR COND SUPPLY PRESS gauge indicator ceases to rise (approximately 21 psi). Adjust as required.
- - - - - WHEN BELOW 15,000 FEET- - - - -
Throttle................................................................................ IDLE

* * * *
Sec. 3 Page 8 MD-80
Rev. 05/15/95 #23 Continental Flight Manual

MANUAL PRESSURIZATION CONTROL

- - - - - PRIOR TO START- - - - -
Cabin Press Control CB (H-2, J-2, U-22, W-22) ............................... PULL
CABIN ALT Control Lever.......................................MANUAL LOCKED
CABIN ALT Control Wheel...........................FULL AFT, VALVE OPEN

Check manual operation of cabin altitude control wheel and indicator prior to placing SUPPLY switches to on by manually rotating wheel and indicator to full VALVE CLOSE (forward) position and return to full VALVE OPEN (aft) position.
Altitude Schedule ..........................................................................REVIEW

Determine the planned cabin altitude at the flight planned cruise altitude using the Altitude Schedule placard.
AIR CONDITIONING SUPPLY Switches........................ AS REQUIRED

Use normal air conditioning procedures.
- - - - - AFTER TAKEOFF- - - - -
CABIN ALT Control Wheel.............ROTATE TO 1/3 VALVE CLOSED

As soon as practical after takeoff, push in and rotate the wheel forward to position the position indicator 1/3 of the quadrant toward VALVE CLOSE and lock.
- - - - - DURING CLIMB, CRUISE, DESCENT- - - - -
CABIN ALT Control Wheel..............................................AS REQUIRED

Push in and rotate the pressure control wheel to maintain desired rate of climb (approximately 500 fpm), cruise (zero rate of change), and descent (approximately 300-400 fpm).
Note:  The control wheel settings require constant attention and frequent resetting. Make all throttle movements slowly and coordinate the throttle movement with the pilot working the cabin altitude control wheel.
(Continued)
MD-80 Sec. 3 Page 9
Flight Manual Continental Rev. 05/15/95 #23

- - - - - LANDING- - - - -
When cabin altitude is 2000 feet above destination field elevation:
CABIN ALT Control Wheel...........................FULL AFT, VALVE OPEN

Maintain cabin rate at zero until cabin altitude equals airplane altitude. Slowly move CABIN ALT control wheel to position outflow valve position indicator to VALVE OPEN. Wheel and indicator should remain in this position for remainder of flight.
Note:  During approach and landing, cabin altitude will decrease at same rate as airplane altitude.
* * * *
RADIO FAN OFF LIGHT ON

Radio Fan CB’s (H and J-4, 5, 6) ..............................RESET IF TRIPPED

IF Radio Fan CB’s Are Not Tripped Or Will Not Reset:
RADIO RACK Switch ......................................................... VENTURI

Note:  Consider descending if live cargo on board. If operating on one pack and not able to hold the desired differential pressure, the RADIO RACK switch may be returned to FAN.
- - - - - AFTER LANDING - - - - -
RADIO FAN OFF light will come on.
Electrical Power............................................................................REDUCE

Prolonged use of airplane electrical systems for ground operations will cause overheating of radio and electronic equipment. Turn off all unnecessary radio and electronic equipment.
* * * *
Sec. 3 Page 10 MD-80
Rev. 01/01/97 #25 Continental Flight Manual

SUPPLY PRESSURE DROPS RAPIDLY TO ZERO

Note:  This could indicate that one of the protective overheat switches has closed and shutdown the system.
AIR CONDITIONING SUPPLY Switch (Affected System).......OFF

Allow sufficient time for cooling.
Applicable TEMP CONTROL VALVE Indicator........... OBSERVE

IF  Indicates in HOT Range: 
Temperature Selector (Affected System)..................... COOLER 
IF  Indicates in COLD Range: 
　
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