A G-200 APU access door was closed and locked by key before the outer door latches were closed which...

Narrative:

During preflight of aircraft that was coming out of a dual engine change it was noticed that APU access door was partially closed/locked. This is perhaps a similar event that occurred on another aircraft during preflight on similar event. On this date and upon closer inspection of APU access door it was noted that the door was indeed locked; but it seemed not correct. Upon use of ladder and closer inspection is determined that outer door latches were place in locked position before door was closed. The separate key lock for the door was in proper position and lower push button type locks were in down/locked position. Those were correct; but the push buttons on the 9 o'clock and 3 o'clock were already in down position when door was opened. Door was then properly secured and flight was normal and uneventful. This may or may not have been a similar situation that occurred on subsequent event on the other aircraft when APU access door opened in flight that required FAA/NTSB investigation. Photos of the door were forwarded to the company during preflight and was asked to file a report.particular attention should be taken during preflight inspection and determine that the APU access door is indeed secured properly. It may require opening the door and determine that all latches are properly positioned and in proper location.

Original NASA ASRS Text

Title: A G-200 APU Access Door was closed and locked by key before the outer door latches were closed which could allow the door to open in flight.

Narrative: During preflight of aircraft that was coming out of a dual engine change it was noticed that APU access door was partially closed/locked. This is perhaps a similar event that occurred on another aircraft during preflight on similar event. On this date and upon closer inspection of APU access door it was noted that the door was indeed locked; but it seemed not correct. Upon use of ladder and closer inspection is determined that outer door latches were place in locked position BEFORE door was closed. The separate key lock for the door was in proper position and lower push button type locks were in down/locked position. Those were correct; but the push buttons on the 9 o'clock and 3 o'clock were already in down position when door was opened. Door was then properly secured and flight was normal and uneventful. This may or may not have been a similar situation that occurred on subsequent event on the other aircraft when APU access door opened in flight that required FAA/NTSB investigation. Photos of the door were forwarded to the Company during preflight and was asked to file a report.Particular attention should be taken during preflight inspection and determine that the APU access door is indeed secured properly. It may require opening the door and determine that all latches are properly positioned and in proper location.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1170452
Time
Date	201405
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream G200 (IAI 1126 Galaxy)
Operating Under FAR Part	Part 91
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	APU
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural FAR

A G-200 APU access door was closed and locked by key before the outer door latches were closed which could allow the door to open in flight.