The APU fire control switch is wired in series with the APU master switch and must be in the NORM position to effect an APU start.
APU Bus Switches................................................................................... OFF

One Center or Right Main Tank FUEL Boost Pump............................ON

If center tank quantity is below 800 lbs., avoid operating the APU with
the center boost pumps on and main boost pumps off.  Air may be
ingested into the APU fuel line preventing APU start or causing APU
flameout. Start Pump (If no AC power available) .................................................. ON APU Master Switch .......................................................START, RELEASE
Hold the APU Master Switch in the START position until observing the
initial rise in RPM and then release the switch to the RUN position.
Confirm the APU OIL PRESS LOW light illuminates at initiation of start and
extinguishes prior to 95% RPM.  If RPM does not indicate rotation, or
EGT does not rise within 20 seconds, or RPM stabilizes at less than idle
RPM, move the APU Master Switch to OFF and refer to the APU NO
ROTATION / NO START / HUNG START checklist in Section 3.
Start Pump (After AC Fuel Pump On) ...................................................OFF

Note:  If operating only on ground service bus power, the right aft AC boost pump should be used. 
Note:  The DC start pump has no provision for cooling and should not be used for extended periods of time. 

APU Electric Power
Volts/Freqs.....................................................................................CHECKED

This check is necessary to determine the operating status of the APU generator. It will be necessary to place the volts/freq. switch in the APU position for this test. If voltage and frequency are not indicated momentarily, place the APU generator switch to RESET. If generator voltage and frequency are abnormal, determine whether generator or APU is at fault by checking APU RPM indicator for normal indication. If the generator is operating normally, the blue power available lights will be on.

APU BUS Switches .....................................................................................ON

Place the left APU power switch to ON. Confirm AC EMERGENCY BUS OFF and DC EMERGENCY BUS OFF annunciator panel lights are extinguished. Place the right APU power switch to ON. Confirm that the following annunciator panel lights are extinguished: L AC BUS OFF, R AC BUS OFF, DC BUS OFF. Check the APU POWER IN USE light comes on.
Using APU For Air Conditioning
APU Air Switch......................................................................AS REQUIRED

Note:  If cabin temperature is 75°F or higher, move APU air switch to AIR COND COLDER. If cabin temperature is below 75°F, move the APU switch to ON.
Air Conditioning Supply Switches........................................... HP BLD OFF

Note:  Due to high electrical starting loads of the heat exchanger cooling fans, pack switches should be turned on one at a time.
Note:  When using APU generator for electrical power, two air conditioning units on may exceed 100% limit of APU generator.
Note:  If AIR CONDITIONING PRESS gauges indicate less than 12 psi, operate only one air conditioning system.
INTENTIONALLY LEFT BLANK
MD-80  Sec. 4 Page 11 
Flight Manual  Continental  Rev. 12/01/00  #29 
PREFLIGHT INSPECTIONS 

General
Before accepting an aircraft, a thorough exterior and interior check should be made including both flight deck and cabin areas.  The responsibility for these checks rests with the Captain.  However, the Captain may delegate this duty to the First Officer.  The cabin inspection may be delegated to a Flight Attendant.
A complete exterior inspection will be accomplished on each origination flight or crew change.  Subsequent inspections are to be performed at each station in accordance with the EXTERIOR INSPECTION - THROUGH FLIGHT procedure, this section.
Upon arrival at the aircraft, the following procedures are normally accomplished in the designated order:
1.
Exterior Safety Inspection

2.
Cockpit Safety Inspection (if required)

3.
Establish Electrical Power (AC and DC)

4.
Establish Air Conditioning (if required)

5.
Cockpit Inspection

6.
Cabin Inspection (if required)

7.
Exterior Inspection

8.
First Flight of the Day or Receiving Aircraft Procedure/Checklist

When operationally efficient during crew changes, the exterior inspection may be accomplished while waiting for passengers and crew to deplane. When this is done, the requirements of the exterior inspection preamble still apply except that the parking brake may not be set and the hydraulic and fuel systems may not be pressurized.
　
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