<< >> NASA ASRS Report 1451145, May 2017

B757-200 flight crew reported may have taken off with flaps 1 instead of the planned and calculated flaps 5.

Attributes
ACN	1451145
Time
Date	201705
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy

Narrative:

Possible flaps 1 takeoff. Pm reported after clean up; we may have had flaps 1 for departure vice normal flaps 5 setting. During the before takeoff checklist PF checked flap indicator and believed to have seen flaps appropriately configured at flaps 5. Rotation seemed normal with no indication of tail strike during liftoff. Rotation was easy; aircraft flew off ground normally.performance parameters:V1 139VR 143v2 146Rotation occurred approximately 147 kts nose attitude approximately 8 degrees pitch. I still find it difficult to believe I missed this during the before takeoff checks. Possible expectation bias. Make sure aircraft is configured appropriately during before takeoff checks.

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Original NASA ASRS Text

Title: B757-200 flight crew reported may have taken off with flaps 1 instead of the planned and calculated flaps 5.

Narrative: Possible flaps 1 takeoff. PM reported after clean up; we may have had flaps 1 for departure vice normal flaps 5 setting. During the before takeoff checklist PF checked flap indicator and believed to have seen flaps appropriately configured at flaps 5. Rotation seemed normal with no indication of tail strike during liftoff. Rotation was easy; aircraft flew off ground normally.Performance parameters:V1 139VR 143V2 146Rotation occurred approximately 147 kts nose attitude approximately 8 degrees pitch. I still find it difficult to believe I missed this during the before takeoff checks. Possible expectation bias. Make sure aircraft is configured appropriately during before takeoff checks.

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.