B757 flight crew experienced a te flap disagree on final approach when selecting flaps 25. Flaps sta...

Narrative:

On a stable normal ILS approach in VMC conditions; light winds; to runway xxl we received a te flap disagree message and warning/caution after captain selected flaps 25. The aircraft was configured for the ATC assigned 160 KTS to zzzzz intersection (flaps 20; gear down; autopilot on). Just prior to zzzzz; I called for flaps 25 and began to slow the aircraft for final approach speed. We received the message and after a brief scan of the instruments could see the flap lever was in the 25 detent; but the flap gauge indicated both remained in the flaps 20 position. Everything else appeared normal. The captain and I had a brief and succinct discussion about our situation and he said; 'continue.' he looked up the appropriate flaps 20 landing speed and set it and I turned off the auto pilot and hand flew the remaining portion of the approach and landing. The landing was uneventful otherwise. Once we cleared the runway we did not retract the flaps; called operations and informed them we would be arriving with flaps extended and then called maintenance. Maintenance concurred that they wanted the flaps to remain as-is for inspection and said they would meet us at the gate for a de-brief. We taxied to gate; parked; deplaned the passengers and waited for maintenance. They arrived a few minutes later. At some point during the 5-10 minutes at the gate; the flaps recovered and extended to 25 to match the lever position.

Original NASA ASRS Text

Title: B757 flight crew experienced a TE Flap Disagree on final approach when selecting Flaps 25. Flaps stayed at 20 and crew landed at adjusted speed without incident.

Narrative: On a stable normal ILS approach in VMC conditions; light winds; to Runway XXL we received a TE FLAP DISAGREE message and warning/caution after Captain selected Flaps 25. The aircraft was configured for the ATC assigned 160 KTS to ZZZZZ Intersection (Flaps 20; gear down; autopilot ON). Just prior to ZZZZZ; I called for Flaps 25 and began to slow the aircraft for final approach speed. We received the message and after a brief scan of the instruments could see the flap lever was in the 25 detent; but the flap gauge indicated both remained in the Flaps 20 position. Everything else appeared normal. The Captain and I had a brief and succinct discussion about our situation and he said; 'Continue.' He looked up the appropriate Flaps 20 landing speed and set it and I turned off the auto pilot and hand flew the remaining portion of the approach and landing. The landing was uneventful otherwise. Once we cleared the runway we did not retract the flaps; called Operations and informed them we would be arriving with flaps extended and then called Maintenance. Maintenance concurred that they wanted the flaps to remain as-is for inspection and said they would meet us at the gate for a de-brief. We taxied to gate; parked; deplaned the passengers and waited for Maintenance. They arrived a few minutes later. At some point during the 5-10 minutes at the gate; the flaps recovered and extended to 25 to match the lever position.

Data retrieved from NASA's ASRS site as of July 2013 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	1133953
Time
Date	201312
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Tower
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Flap Control (Trailing & Leading Edge)
Person 1
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe

B757 flight crew experienced a te flap disagree on final approach when selecting flaps 25. Flaps stayed at 20 and crew landed at adjusted speed without incident.