<< >> NASA ASRS Report 1610078, January 2019

B737 first officer reported trailing edge flaps failed to extend; crew executed a go-around and landed with flaps 15 using the manual extension system.

Attributes
ACN	1610078
Time
Date	201901
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Component
Aircraft Component	Trailing Edge Flap
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 175 Flight Crew Total 17000 Flight Crew Type 4700
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

During a visual approach and while configuring the aircraft for landing; the trailing edge flaps failed to extended past 8 degrees. The flap failure occurred approximately 5 miles from the runway threshold and a missed approach was executed. The flight crew performed the trailing edge flaps disagree checklist which eventually required manual extension of the trailing edge flaps using the alternate flaps extension system. Subsequently; the flight crew was cleared for an ILS approach; extended the trailing edge flaps manually; and landed with flaps 15 without further issue. It should be noted that never were any flap extension speeds exceeded.

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Original NASA ASRS Text

Title: B737 First Officer reported trailing edge flaps failed to extend; crew executed a go-around and landed with flaps 15 using the manual extension system.

Narrative: During a visual approach and while configuring the aircraft for landing; the trailing edge flaps failed to extended past 8 degrees. The flap failure occurred approximately 5 miles from the runway threshold and a missed approach was executed. The flight crew performed the Trailing Edge Flaps Disagree Checklist which eventually required manual extension of the trailing edge flaps using the Alternate Flaps Extension System. Subsequently; the flight crew was cleared for an ILS approach; extended the trailing edge flaps manually; and landed with flaps 15 without further issue. It should be noted that never were any flap extension speeds exceeded.

Data retrieved from NASA's ASRS site 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.