If unable to avoid icing areas, refer to AIRFOIL ICE PROTECTION INOPERATIVE, this section.
Note:  Difficulty may be encountered in maintaining cabin differential pressure due to pressurization loss through the ruptured duct.
* * * *
ENG VALVE LIGHT(S) ON

Note:  Indicates one or more of the engine anti-ice valves is not in agreement with the ENG anti-ice switch position.
ANTI-ICING VALVE C/Bs (K-30, 31, 32 / L-30, 31, 32) .............................. RESET IF TRIPPED
ENG Anti-Ice Switch (Affected System)........................... RECYCLE

IF  ENG Anti-Ice Switch Is On and ENG VALVE Light Is On: 
IGN Selector Switch.........................................................A OR B 
Depart icing area as soon as possible. Maintain engine operation at 
OR  desired thrust level. Minimize throttle movement until clear of 
icing area. Make a logbook entry. 
* * * * 
ENG Anti-Ice Switch Is Off and ENG VALVE Light Is On: 
Make a logbook entry. 
* * * * 

MD-80 Sec. 3 Page 93
Flight Manual Continental Rev. 08/01/98  #27

ICE PROTECT SUPPLY PRESS HI LIGHT ON

PNEU X-FEED VALVE Levers .................... MOVE TOWARD CLOSE
PNEU PRESS Gauge ............................................................... OBSERVE

When PNEU PRESS gauge reads approximately 22 psi, stop moving PNEU X-FEED VALVE levers. Readjust when power, speed, or altitude is changed.
* * * *
ICE PROTECT TEMP HIGH LIGHT ON

Caution:  ICE PROTECT TEMP HI annunciation may indicate failure of a pneumatic augmentation valve in the open position. If this valve is failed in the open position, the start valve may be blown open during high engine power settings leading to starter failure. If START VALVE OPEN light illuminates inflight, refer to START VALVE OPEN LIGHT ON IN FLIGHT checklist.
PNEU X-FEED VALVE Lever (Affected System).....................CLOSED

Note:  Closing affected system PNEU X-FEED VALVE lever deactivates temperature control of associated augmentation valve. Augmentation valve is now controlled by associated air conditioning system pressure demands.
IF There Are Two Airfoil Anti-Ice Switches:
AIR FOIL Anti-Ice Switch (Affected System)............................. OFF

Note:  Moving AIR FOIL Anti-Ice switch to OFF deactivates temperature control of associated augmentation valve. Augmentation valve is now controlled by associated air conditioning system pressure demands.
* * * *
Sec. 3 Page 94 MD-80
Rev. 12/01/00 #29 Continental Flight Manual

ICE PROTECT TEMP LOW LIGHT ON

PNEU X-FEED VALVE Lever (Affected System)..........................OPEN

Note: If at low engine power, advance power.
ICE PROTECT AUGMENT VALVE Circuit Breaker (M & N-23) ................................................ RESET IF TRIPPED
IF Unable To Correct Condition:
PNEU X-FEED VALVE Lever (Affected System)..............CLOSED

IF There Are Two Airfoil Anti-Ice Switches:
AIR FOIL Anti-Ice Switch (Affected System)......................OFF

* * * *
MD-80 Sec. 3 Page 95
Flight Manual Continental Rev. 01/01/97  #25

PITOT / STALL HEATER OFF LIGHT ON

Verify METER SEL & HEAT selector is not in OFF.
Failed Unit........................................................................... DETERMINE

Rotate METER SEL & HEAT selector and check for heater current. If any unit indicates no heater current, crosscheck appropriate instruments for valid indications.
Note:  If in icing conditions, airspeed and mach may be restored by moving CADC selector to BOTH ON 1 or BOTH ON 2 as appropriate.
Note:  AHRS 1 and/or 2 may revert to basic mode whenever erroneous airspeed inputs are received from either CADC.
Applicable Circuit Breakers.................................... RESET IF TRIPPED

CAPTAIN’S PITOT HEATER  - Overhead Panel  C-12 
PITOT HEATER AUX  - Lower EPC  M-28 
PITOT HEATER F/O  - Lower EPC  N-28 
RUDDER Q LIMITER  - Lower EPC  Z-30 
L/R STALL PROBE (AOA)  - Lower EPC  X-22, Z-22 

Caution:  A tripped circuit breaker may be reset only once. If a circuit breaker trips after it has been reset, the cause should be determined and corrected before attempting a subsequent reset.
IF PITOT/STALL HEATER OFF Light Remains On:
Depart icing area.
* * * *
Sec. 3 Page 96 MD-80
Rev. 12/01/00 #29 Continental Flight Manual

INTENTIONALLY LEFT BLANK

MD-80 Sec. 3 Page 97
Flight Manual Continental Rev. 05/15/95  #23

SEVERE RAIN / ICE / TURBULENCE

ENG IGN Selector .............SYS A OR SYS B / GRD START & CONTIN
　
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