While extending flaps; a B737-800 flight crew experienced a flap problem where the flap position sho...

Attributes
ACN	1409152
Time
Date	201612
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach Landing
Flight Plan	IFR
Component
Aircraft Component	Flap/Slat Indication
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

As the pilot flying; while maneuvering in the busy terminal area; I didn't notice that the flap indicator did not match the handle (2 indicated; 30 selected) until the captain identified it with the mechanical before landing checklist. We checked the led indicator on the overhead panel; the led's were full ext. We discussed how the aircraft felt as it was being hand flown; the feel was normal. We discussed the fact that the airspeed indicator was normal. The aircraft flew normal in all aspects except the flap indication. All this occurred approaching the final approach fix. The captain elected to continue to land. We used flap 15 vref and added 10 KIAS. Landing was uneventful. The flap indicator moved to match the handle shortly after clearing the runway during taxi. We notified maintenance on gate arrival.monitoring the flap indication after selecting a flap position was not adequate. After the initial flap selection we flew in that configuration for some time. The remaining configuration changes happened very quickly as we approached the final approach fix.

Original NASA ASRS Text

Title: While extending flaps; a B737-800 flight crew experienced a flap problem where the flap position shown on the flap position indicator did not match the flap lever position; but it was not discovered until the Captain performed the before landing checklist.

Narrative: As the Pilot Flying; while maneuvering in the busy terminal area; I didn't notice that the flap indicator did not match the handle (2 indicated; 30 selected) until the Captain identified it with the mechanical before landing checklist. We checked the LED indicator on the overhead panel; the LED's were full Ext. We discussed how the aircraft felt as it was being hand flown; the feel was normal. We discussed the fact that the airspeed indicator was normal. The aircraft flew normal in all aspects except the flap indication. All this occurred approaching the final approach fix. The Captain elected to continue to land. We used Flap 15 Vref and added 10 KIAS. Landing was uneventful. The flap indicator moved to match the handle shortly after clearing the runway during taxi. We notified maintenance on gate arrival.Monitoring the flap indication after selecting a flap position was not adequate. After the initial flap selection we flew in that configuration for some time. The remaining configuration changes happened very quickly as we approached the Final Approach Fix.

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.

While extending flaps; a B737-800 flight crew experienced a flap problem where the flap position shown on the flap position indicator did not match the flap lever position; but it was not discovered until the captain performed the before landing checklist.