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A B757-200 was dispatched in non compliance with the APU pneumatics improperly deferred as inoperative due to a broken pneumatic duct.
| Attributes | |
| ACN | 465012 |
| Time | |
| Date | 200003 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : hpn.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 10 maintenance technician : 10 |
| ASRS Report | 465012 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | technician : airframe technician : powerplant |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel maintenance problem : improper maintenance non adherence : published procedure |
| Resolutory Action | flight crew : landed as precaution |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : repair performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On aircraft xyz (flight wvx) I deferred a write-up generated after the aircraft's arrival in ZZZ. Aircraft was an etop's going from ZZZ to XXX. I deferred the APU bleed believing the blown duct as after the APU bleed shutoff. I deferred it with the help of the area (team leader -- foreman). I was the acting lead aircraft maintenance technician in the ZZZ maintenance terminal. Subsequently I found out that this duct was before the APU bleed shutoff. During a call from maintenance control I was told the aircraft would be called back to return to ZZZ. When the aircraft returned to ZZZ the duct was replaced with a borrowed part. The aircraft then departed ZZZ for XXX again as flight wvx).
Original NASA ASRS Text
Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE APU PNEUMATICS IMPROPERLY DEFERRED AS INOP DUE TO A BROKEN PNEUMATIC DUCT.
Narrative: ON ACFT XYZ (FLT WVX) I DEFERRED A WRITE-UP GENERATED AFTER THE ACFT'S ARR IN ZZZ. ACFT WAS AN ETOP'S GOING FROM ZZZ TO XXX. I DEFERRED THE APU BLEED BELIEVING THE BLOWN DUCT AS AFTER THE APU BLEED SHUTOFF. I DEFERRED IT WITH THE HELP OF THE AREA (TEAM LEADER -- FOREMAN). I WAS THE ACTING LEAD ACFT MAINT TECHNICIAN IN THE ZZZ MAINT TERMINAL. SUBSEQUENTLY I FOUND OUT THAT THIS DUCT WAS BEFORE THE APU BLEED SHUTOFF. DURING A CALL FROM MAINT CTL I WAS TOLD THE ACFT WOULD BE CALLED BACK TO RETURN TO ZZZ. WHEN THE ACFT RETURNED TO ZZZ THE DUCT WAS REPLACED WITH A BORROWED PART. THE ACFT THEN DEPARTED ZZZ FOR XXX AGAIN AS FLT WVX).
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.