A B757-200 on final approach at 1500 ft when selecting flaps 30 degrees from flaps 25 degrees the flaps retracted to flaps 20 degrees with EICAS message 'flap load relief.'

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Attributes
ACN	667219
Time
Date	200508
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	667219
Person 2
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas message 'flap load relief' other flight crewa other flight crewb
Resolutory Action	none taken : unable
Consequence	other
Factors
Maintenance	performance deficiency : fault isolation performance deficiency : repair
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Ambiguous

Narrative:

On final approach; at appropriate speeds; flaps 25 degrees. When flap handle raised out of the 25 degree flaps detent to select flaps 30 degrees; flaps blew up to flaps 20 degrees. Got 'trailing edge' light and 'flap load relief' EICAS message. Aircraft flew normally at flaps 20 degrees; landed at flaps 20 degrees and reported problem to maintenance. They said aircraft had previous history and took it OTS.

Original NASA ASRS Text

Title: A B757-200 ON FINAL APCH AT 1500 FT WHEN SELECTING FLAPS 30 DEGS FROM FLAPS 25 DEGS THE FLAPS RETRACTED TO FLAPS 20 DEGS WITH EICAS MESSAGE 'FLAP LOAD RELIEF.'

Narrative: ON FINAL APCH; AT APPROPRIATE SPDS; FLAPS 25 DEGS. WHEN FLAP HANDLE RAISED OUT OF THE 25 DEG FLAPS DETENT TO SELECT FLAPS 30 DEGS; FLAPS BLEW UP TO FLAPS 20 DEGS. GOT 'TRAILING EDGE' LIGHT AND 'FLAP LOAD RELIEF' EICAS MESSAGE. ACFT FLEW NORMALLY AT FLAPS 20 DEGS; LANDED AT FLAPS 20 DEGS AND RPTED PROB TO MAINT. THEY SAID ACFT HAD PREVIOUS HISTORY AND TOOK IT OTS.

Data retrieved from NASA's ASRS site as of January 2009 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.