Pilot technique preflight procedures operated inoperative APU. Aircraft maintenance discrepancy.

Attributes
ACN	275890
Time
Date	199406
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mem
State Reference	TN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bos
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : private pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 200
ASRS Report	275890
Person 2
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Arrived at very hot steamy aircraft. APU deferred as inoperative for doors. Turned on switch, doors opened. Visually checked and inlet door opened, APU started and worked normally. Notified maintenance. Maintenance said try it again in dfw. Worked normally. Shut it down for maintenance to take a look. Found #2 fire bottle squib switch blown off bottle with damage to APU exhaust intake and halon feed tube to #2 engine. APU deferred on MEL 49-1. Should have been deferred on 49-2 APU. Doors inoperative collared circuit breakers.

Original NASA ASRS Text

Title: PLT TECHNIQUE PREFLT PROCS OPERATED INOP APU. ACFT MAINT DISCREPANCY.

Narrative: ARRIVED AT VERY HOT STEAMY ACFT. APU DEFERRED AS INOP FOR DOORS. TURNED ON SWITCH, DOORS OPENED. VISUALLY CHKED AND INLET DOOR OPENED, APU STARTED AND WORKED NORMALLY. NOTIFIED MAINT. MAINT SAID TRY IT AGAIN IN DFW. WORKED NORMALLY. SHUT IT DOWN FOR MAINT TO TAKE A LOOK. FOUND #2 FIRE BOTTLE SQUIB SWITCH BLOWN OFF BOTTLE WITH DAMAGE TO APU EXHAUST INTAKE AND HALON FEED TUBE TO #2 ENG. APU DEFERRED ON MEL 49-1. SHOULD HAVE BEEN DEFERRED ON 49-2 APU. DOORS INOP COLLARED CIRCUIT BREAKERS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.