<< >> NASA ASRS Report 368976, May 1997

A B737-200 on final approach executed a missed approach due to trailing edge flap asymmetrical shutoff.

Attributes
ACN	368976
Time
Date	199705
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bos
State Reference	MA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : missed approach landing other
Route In Use	approach : straight in arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 150 flight time total : 12500 flight time type : 150
ASRS Report	368976
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	aircraft : equipment problem dissipated other other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On final approach, while configuring for landing, flaps stopped moving apparently due to asymmetrical split in gauge. Flap handle married with lowest indication (flap 1) and missed approach initiated. Straight and level on downwind prior to commencing checklist, flap gauge needles married as did flaps. Flaps then worked normally and we were resequenced for normal uneventful landing. Callback conversation with reporter revealed the following information: reporter said the aircraft was a B737-200. After making the missed approach the reporter stated the flap indicator needles were aligned and the flaps extended normally. The airplane had a previous report on flap extension but the reporter was not sure of the maintenance action taken on this incident or the previous report.

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Original NASA ASRS Text

Title: A B737-200 ON FINAL APCH EXECUTED A MISSED APCH DUE TO TRAILING EDGE FLAP ASYMMETRICAL SHUTOFF.

Narrative: ON FINAL APCH, WHILE CONFIGURING FOR LNDG, FLAPS STOPPED MOVING APPARENTLY DUE TO ASYMMETRICAL SPLIT IN GAUGE. FLAP HANDLE MARRIED WITH LOWEST INDICATION (FLAP 1) AND MISSED APCH INITIATED. STRAIGHT AND LEVEL ON DOWNWIND PRIOR TO COMMENCING CHKLIST, FLAP GAUGE NEEDLES MARRIED AS DID FLAPS. FLAPS THEN WORKED NORMALLY AND WE WERE RESEQUENCED FOR NORMAL UNEVENTFUL LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID THE ACFT WAS A B737-200. AFTER MAKING THE MISSED APCH THE RPTR STATED THE FLAP INDICATOR NEEDLES WERE ALIGNED AND THE FLAPS EXTENDED NORMALLY. THE AIRPLANE HAD A PREVIOUS RPT ON FLAP EXTENSION BUT THE RPTR WAS NOT SURE OF THE MAINT ACTION TAKEN ON THIS INCIDENT OR THE PREVIOUS RPT.

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.