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A B727-200 was dispatched in non compliance with the first officer's altimeter deferred as inoperative in the corrected mode in conflict with the MEL.
| Attributes | |
| ACN | 436335 |
| Time | |
| Date | 199904 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked ground : preflight |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10900 flight time type : 890 |
| ASRS Report | 436335 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 120 flight time total : 2900 flight time type : 280 |
| ASRS Report | 436730 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : warning flag |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | Minimum Equipment List |
Narrative:
On ramp at ZZZ, noticed the first officer pneumatic servo altimeter oscillating between the barometric mode and static defect correction mode (air data computer). Made appropriate logbook entry and called for maintenance. Maintenance control and dispatch issued placard and MEL and MEL number added to flight release. This required collaring the altimeter circuit breaker to place first officer altimeter in barometric mode. Numerous flts flown under this MEL. Upon return to base, found out that MEL on series 727-2 required aircraft to be grounded because of technicality in wording in MEL and special procedures. Possible quick turnaround time was a factor and vague wording in MEL was also a contributing factor.
Original NASA ASRS Text
Title: A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE FO'S ALTIMETER DEFERRED AS INOP IN THE CORRECTED MODE IN CONFLICT WITH THE MEL.
Narrative: ON RAMP AT ZZZ, NOTICED THE FO PNEUMATIC SERVO ALTIMETER OSCILLATING BTWN THE BAROMETRIC MODE AND STATIC DEFECT CORRECTION MODE (ADC). MADE APPROPRIATE LOGBOOK ENTRY AND CALLED FOR MAINT. MAINT CTL AND DISPATCH ISSUED PLACARD AND MEL AND MEL NUMBER ADDED TO FLT RELEASE. THIS REQUIRED COLLARING THE ALTIMETER CIRCUIT BREAKER TO PLACE FO ALTIMETER IN BAROMETRIC MODE. NUMEROUS FLTS FLOWN UNDER THIS MEL. UPON RETURN TO BASE, FOUND OUT THAT MEL ON SERIES 727-2 REQUIRED ACFT TO BE GNDED BECAUSE OF TECHNICALITY IN WORDING IN MEL AND SPECIAL PROCS. POSSIBLE QUICK TURNAROUND TIME WAS A FACTOR AND VAGUE WORDING IN MEL WAS ALSO A CONTRIBUTING FACTOR.
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.