<< >> NASA ASRS Report 439857, June 1999

A B757-200 was dispatched in non compliance with 2 deferred items both in conflict with the MEL special procedures.

Attributes
ACN	439857
Time
Date	199906
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	oversight : supervisor
Qualification	technician : airframe technician : powerplant
ASRS Report	439857
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure
Independent Detector	other other : 969
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : testing performance deficiency : fault isolation performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft had been previously on jun/xa/99, had an MEL put on the center hydraulic quantity indication for the EICAS. Then on jun/xd/99 the center hydraulic system quantity reservoir light came on, so I put a placard for this light under MEL reference 29-13B. I didn't quite understand the MEL procedures for MEL 29-13 -- which had the mechanic also verify on the eidas, the indication for the quantity, which was on a different MEL placard jun/xa/99 under MEL reference 29-11. The thought it meant you could use either/or procedure to verify it.

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Original NASA ASRS Text

Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH 2 DEFERRED ITEMS BOTH IN CONFLICT WITH THE MEL SPECIAL PROCS.

Narrative: ACFT HAD BEEN PREVIOUSLY ON JUN/XA/99, HAD AN MEL PUT ON THE CTR HYD QUANTITY INDICATION FOR THE EICAS. THEN ON JUN/XD/99 THE CTR HYD SYS QUANTITY RESERVOIR LIGHT CAME ON, SO I PUT A PLACARD FOR THIS LIGHT UNDER MEL REF 29-13B. I DIDN'T QUITE UNDERSTAND THE MEL PROCS FOR MEL 29-13 -- WHICH HAD THE MECH ALSO VERIFY ON THE EIDAS, THE INDICATION FOR THE QUANTITY, WHICH WAS ON A DIFFERENT MEL PLACARD JUN/XA/99 UNDER MEL REF 29-11. THE THOUGHT IT MEANT YOU COULD USE EITHER/OR PROC TO VERIFY IT.

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.