B737-800 first officer reported executing a go-around following a flap abnormality that limited exte...

Narrative:

Normal flight. Good weather. Normal approach. Called in normal sequence for flaps 1; 5; 10; gear down; flaps 15; 25; 30. During landing checklist noticed flap handle in 30 position; but indicator pointing to about 16 or 17. I was about 10 knots less than flap 15 maneuver speed. At this time GPWS too low flaps warning. I executed normal go around to flaps 5 gear up config (in hindsight; maybe we should have kept flaps 15). Captain ran trailing edge flap disagree checklist while I flew an extended vector for the longest [runway]. On configuration to runway xy flaps operated normally and I made a normal landing. Maintenance could not determine what caused the flaps to not operate normally.

Original NASA ASRS Text

Title: B737-800 First Officer reported executing a go-around following a flap abnormality that limited extension to 17 degrees. Later in the approach the flaps operated normally.

Narrative: Normal flight. Good weather. Normal Approach. Called in normal sequence for Flaps 1; 5; 10; Gear Down; Flaps 15; 25; 30. During landing checklist noticed Flap handle in 30 position; but indicator pointing to about 16 or 17. I was about 10 knots less than Flap 15 Maneuver speed. At this time GPWS TOO LOW FLAPS warning. I executed normal Go around to Flaps 5 Gear Up config (In hindsight; maybe we should have kept Flaps 15). Captain ran TRAILING EDGE FLAP DISAGREE checklist while I flew an extended vector for the longest [runway]. On configuration to Runway XY Flaps operated normally and I made a normal landing. Maintenance could not determine what caused the flaps to not operate normally.

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.

Attributes
ACN	1375032
Time
Date	201607
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737-800
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 16500
Events
Anomaly	Aircraft Equipment Problem Less Severe

B737-800 first officer reported executing a go-around following a flap abnormality that limited extension to 17 degrees. Later in the approach the flaps operated normally.