<< >> NASA ASRS Report 502941, March 2001

A B717 returned to the gate a second time for another antiskid warning light. The item was deferred per the MEL, but no bite test was made on the control box.

Attributes
ACN	502941
Time
Date	200103
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 13
ASRS Report	502941
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : overhead anunciator light other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : testing performance deficiency : logbook entry performance deficiency : fault isolation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Inbound aircraft had antiskid malfunction. Item was previously tested and released on previous leg. Fault review of antiskid control box faulted 'antiskid shutoff valve right hydraulics.' secured valve per MEL and bite control box. On taxi out, 'antiskid fault' illuminated on overhead annunciator panel and aircraft returned to gate. This is a dispatchable item, so I sent the flight back out, immediately, in my haste, I did not perform the control box bite again to make sure a different fault caused the message to illuminate. The fault light 'antiskid fault' is discussed in the MEL and the pilots did not read that part of it. The message is the only one allowable under that MEL. After returning to the gate, I should have treated the departure as a new flight and checked the antiskid control box for new faults.

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Original NASA ASRS Text

Title: A B717 RETURNED TO THE GATE A SECOND TIME FOR ANOTHER ANTISKID WARNING LIGHT. THE ITEM WAS DEFERRED PER THE MEL, BUT NO BITE TEST WAS MADE ON THE CTL BOX.

Narrative: INBOUND ACFT HAD ANTISKID MALFUNCTION. ITEM WAS PREVIOUSLY TESTED AND RELEASED ON PREVIOUS LEG. FAULT REVIEW OF ANTISKID CTL BOX FAULTED 'ANTISKID SHUTOFF VALVE R HYDS.' SECURED VALVE PER MEL AND BITE CTL BOX. ON TAXI OUT, 'ANTISKID FAULT' ILLUMINATED ON OVERHEAD ANNUNCIATOR PANEL AND ACFT RETURNED TO GATE. THIS IS A DISPATCHABLE ITEM, SO I SENT THE FLT BACK OUT, IMMEDIATELY, IN MY HASTE, I DID NOT PERFORM THE CTL BOX BITE AGAIN TO MAKE SURE A DIFFERENT FAULT CAUSED THE MESSAGE TO ILLUMINATE. THE FAULT LIGHT 'ANTISKID FAULT' IS DISCUSSED IN THE MEL AND THE PLTS DID NOT READ THAT PART OF IT. THE MESSAGE IS THE ONLY ONE ALLOWABLE UNDER THAT MEL. AFTER RETURNING TO THE GATE, I SHOULD HAVE TREATED THE DEP AS A NEW FLT AND CHKED THE ANTISKID CTL BOX FOR NEW FAULTS.

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.