<< >> NASA ASRS Report 836736, May 2009

A B737-300 flight crew experienced loss of captain's air data instruments. They coordinated with maintenance and dispatch and returned to departure airport.

Attributes
ACN	836736
Time
Date	200905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Air Data Computer
Person 1
Function	Captain
Experience	Flight Crew Last 90 Days 142
Person 2
Function	First Officer
Experience	Flight Crew Last 90 Days 228
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On takeoff captain's altimeter became erratic; and after liftoff; captain's air data instruments became erratic causing ground proximity warnings. First officer's instruments were normal at the time of takeoff so aircraft control was transferred to first officer. Consulted the QRH and maintenance and dispatch coordinated with us and decided to return to our departure airport.

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Original NASA ASRS Text

Title: A B737-300 flight crew experienced loss of Captain's air data instruments. They coordinated with Maintenance and Dispatch and returned to departure airport.

Narrative: On takeoff Captain's altimeter became erratic; and after liftoff; Captain's air data instruments became erratic causing ground proximity warnings. First Officer's instruments were normal at the time of takeoff so aircraft control was transferred to First Officer. Consulted the QRH and Maintenance and Dispatch coordinated with us and decided to return to our departure airport.

Data retrieved from NASA's ASRS site as of April 2012 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.