<< >> NASA ASRS Report 820326, January 2009

A B757 flap asymmetry was detected at 1;500 ft on short final when selecting flaps 25. Flaps 20 were selected; the emergency checklist completed and the aircraft continued for a landing. An emergency was declared with ATC.

Attributes
ACN	820326
Time
Date	200901
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Flap Control (Trailing & Leading Edge)
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 140 Flight Crew Total 2600 Flight Crew Type 7000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Visual approach. Vectored onto final at FAF. When selecting flaps to 25 degrees; flap indicator showed asymmetry. I returned flap selector to 20 degrees; accomplished procedural items of checklist and proceeded to land with flaps 20 degrees. I declared an emergency on short final. After landing; I advised tower that equipment would not be necessary as landing was uneventful; and taxied to gate. No flap speeds were exceeded.

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Original NASA ASRS Text

Title: A B757 flap asymmetry was detected at 1;500 FT on short final when selecting flaps 25. Flaps 20 were selected; the emergency checklist completed and the aircraft continued for a landing. An emergency was declared with ATC.

Narrative: Visual approach. Vectored onto final at FAF. When selecting flaps to 25 degrees; flap indicator showed asymmetry. I returned flap selector to 20 degrees; accomplished procedural items of checklist and proceeded to land with flaps 20 degrees. I declared an emergency on short final. After landing; I advised Tower that equipment would not be necessary as landing was uneventful; and taxied to gate. No flap speeds were exceeded.

Data retrieved from NASA's ASRS site as of April 2012 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.