Note:  Do not conduct an ILS-coupled approach or autoland if the AP Trim light is on in excess of three seconds, in a stabilized configuration, while tracking the glideslope.
* * * *
Sec. 3 Page 20 MD-80
Rev. 08/01/97 #27 Continental Flight Manual

INTENTIONALLY LEFT BLANK

MD-80 Sec. 3 Page 21
Flight Manual Continental Rev. 05/15/95  #23

ELECTRICAL

AC CROSSTIE LOCKOUT LIGHT ON ONLY

Note:  Use this procedure for only the AC Crosstie Lockout light
illuminated.

IF  Aircraft Is On The Ground:

AC Crosstie Relay .............................................................. RESET

The AC Crosstie Reset switch is located behind the Captain’s seat on some aircraft, or in the E & E Compartment on the other aircraft.
IF  Unable To Access The Reset Switch:
Electrical Power ............................................................... OFF

OR
Remove all electrical power from the aircraft.
Electrical Power .................................................... RESTORE

IF  Light Is Still Illuminated:
Contact Maintenance.

* * * *
IF  Aircraft Is In The Air:
APU.....................................................................................START
L And R APU Bus Switch .........................................................ON

This will provide backup power in the event of a generator
failure.
Caution: No other action is authorized.
* * * *
Sec. 3 Page 22 MD-80
Rev. 08/01/98 #27 Continental Flight Manual

AC CROSSTIE LOCKOUT, AC BUS OFF (L OR R)
GEN OFF (L, R, OR APU), AND DC BUS OFF
LIGHTS ON
GEN FEEDER FAULT (L, R, OR APU)
LIGHT MAY ALSO BE ON

Fuel Boost Pump Switches ............................................................. ALL ON
DC BUS X-TIE Switch ....................................................................CLOSE

Monitor DC LOAD meters.
Affected Engine (or APU)
GEN Switch...................................................... RESET, OFF (OR NORM)

IF AC Volts / Frequency Are Within Allowable Limits:
GEN (or APU BUS) Switch ........................................................ ON

IF AC Load Is Within Allowable Limits:
DC BUS X-TIE Switch ................................................... OPEN

Monitor system, all busses restored.
Note:  AC crosstie relay will remain locked open until
OR 
 reset on the ground. APU generator, if available, 
may be selected as backup. 
* * * * 
IF  AC Load Is Not Within Allowable Limits: 
Continue checklist at . 

IF AC Volts / Frequency Are Not Within Allowable Limits:
. GEN (or APU BUS) Switch............................................................ OFF

Generator cannot be used. Do not attempt further resets.
APU Generator Availability ........................................ DETERMINE

Note:  Prior to starting APU, verify APU L/R BUS switches are in OFF. If right generator bus is not powered, battery charger will be inoperative. More than one APU start attempt will reduce battery power and result in less than 30 minutes of emergency power if all AC power is lost.

(Continued)
MD-80 Sec. 3 Page 23
Flight Manual Continental Rev. 08/01/98  #27

IF APU Generator Is Available (AC Volts / Freq Within Limits):
APU Bus Switch (Affected Side) .................................ON

IF AC Load Is Within Allowable Limits:

DC BUS X-TIE Switch....................................OPEN

Monitor system, all busses restored.
OR
Note:  AC crosstie relay will remain locked open until reset on the ground.

* * * *
IF AC Load Is Not Within Allowable Limits:
Generator bus cannot be restored. Reset APU generator if required. Select APU BUS switch to provide backup for the operating system.
Continue checklist at .
IF APU Generator Is Not Available:
. Continue flight with affected system inoperative. IF There is Fuel Remaining in the Center Tank: Main Tank Boost Pump Switches (One at a Time) ............................................... OFF
- - - - WHEN CENTER TANK INDICATES 500 LBS - - - -
Main Tank Boost Pump Switches ........................... ALL ON

Note:  Remaining center tank fuel may be used by leaving tank pump switches in one main tank OFF. When center tank indicates zero or INLET FUEL PRESS LOW light is on, move main tank pump switches for that tank back to ON.
* * * *
Sec. 3 Page 24 MD-80
Rev. 05/15/95 #23 Continental Flight Manual

AC EMER BUS OFF LIGHT ON

IF  Phase Of Flight Is Critical And Captain’s Flight Instruments Are Inoperative:
　
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