Airplane Control Is Normal:

Continue flight with RUD HYD CONT lever in MAN.
* * * *
Airplane Control Is Abnormal:
YAW DAMP Switch....................................................OVRD

Note:  With YAW DAMP switch in OVRD, actuator is deactivated, making yaw damper inoperative even with autopilot engaged.
If required, RUD HYD CONT lever may be returned to PWR. Verify
rudder pedals and trim are centered prior to moving lever. If aircraft exhibits abnormal motions (due to lack of yaw damping), descend to FL280 or below and recalculate fuel requirements.
Autopilot / Autothrottles.............................. AS REQUIRED

* * * *

Sec. 3 Page 42-B MD-80
Rev. 01/01/97 #25 Continental Flight Manual

INTENTIONALLY LEFT BLANK

MD-80 Sec. 3 Page 43
Flight Manual Continental Rev. 08/01/98  #27

AUTO SLAT FAIL LIGHT ON

The AUTO SLAT FAIL light on indicates failure of one or both stall warning systems.
Note:  One operable system is capable of providing auto slats.  With a dual system failure, the pilot can still extend slats to at least MID SEALED position. Full extension may be possible depending on which system component has failed.
Slat Extension....................................................................... MAX 240 KTS

Do not extend the slats until below 240 KIAS, as slats may extend to full
position.
* * * *
AUTO SPOILER DO NOT USE LIGHT ON OR
UNABLE TO ARM AUTO SPOILERS

Before Takeoff And Aircraft Has Autobrakes:
Verify takeoff and landing weight penalties are applied.
Do not arm spoilers or autobrakes.
If takeoff is rejected, spoilers should be extended manually by

OR
squeezing spoiler lever, lifting up, and pulling fully aft into latch. Normal anti-skid braking is available.
* * * *

IF On Approach (All Aircraft):
Add 470 feet to the landing distance on a dry runway (540 feet on a
wet runway).
Do not arm spoilers or autobrakes before landing.
Make normal approach and landing.

- - - - - AFTER LANDING - - - - -
Spoiler Lever ............................................................. UP, AFT, UP

* * * *

Sec. 3 Page 44 MD-80
Rev. 05/15/95 #23 Continental Flight Manual

MACH TRIM INOPERATIVE

Note: Failure of the mach trim compensator is confirmed by the mach trim indicator failing to extend, retract, or is oscillating.
MACH TRIM COMP Switch.................................................... OVRD

IF  Mach Trim Indicator Does Not Retract: 
MACH TRIM OVERRIDE 
Circuit Breaker (X-33)...................................PULL AND RESET 
IF  Mach Trim Indicator Does Not Retract: 
MACH TRIM COMP Switch .......................VERIFY OVRD 
MACH TRIM OVERRIDE 
Circuit Breaker (X-33).................................................. PULL 
Note:  This action prevents inadvertent retraction. 
Continue checklist at . 
IF  Mach Trim Compensator is Retracted: 

. Observe mach speed limitation of .78. Retrim as required. Use normal landing techniques.
* * * *
MD-80 Sec. 3 Page 45
Flight Manual Continental Rev. 05/15/95  #23

OVERSPEED WARNING MALFUNCTION

Note: The overspeed warning will sound normally if Vmo/Mmo is exceeded or if slats are extended above 280 KIAS. System Activates At/Above .79 Mach / 325 KIAS: Slow to below speed at which warning sounds.
* * * *
IF  System Activates Below .79 Mach / 325 KIAS And Slats Are Retracted:
CAWS Overspeed, Eng Fire, Horiz Stab CB (U 31)........... PULL

Caution:  With this CB pulled, in addition to overspeed warning, engine fire and horizontal stabilizer aural warnings are disabled.
Observe the following speed limits:
Below 25,300 feet, Vmo ............................................. 325 KIAS
Above 25,300 feet, Mmo ........................................... 0.79 mach

Caution:  If the system is deactivated, carefully monitor
airspeed/mach indicators.

* * * *
Sec. 3 Page 46 MD-80
Rev. 08/01/98 #27 Continental Flight Manual

RUDDER CONTROL MANUAL LIGHT ON

On Ground:
Maintenance action required.

* * * *
IF In Flight:
RUD HYD CONT Lever....................................................... MAN

Continue operating in manual mode.
WARNING:  Minimum approach speed is 135 KIAS until landing is assured.
IF Right Hydraulic Pressure And/Or Quantity is Low:
Refer to HYD PRESS LOW LIGHT(S) ON or HYDRAULIC QUANTITY LOSS, this section.
* * * *
MD-80 Sec. 3 Page 47
　
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