<< >> NASA ASRS Report 1140548, January 2014

A300 flight crew experiences multiple pitot static system failures upon entering clouds during descent; which immediately disappear upon exiting the clouds. When clouds are entered again the scenario repeats. An emergency is declared to remain clear of clouds during vectors for approach.

Attributes
ACN	1140548
Time
Date	201401
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Descent
Component
Aircraft Component	Pitot-Static System
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Narrative:

On arrival descending through approximately 16;000 ft as we entered the clouds we encountered multiple failures. First officer airspeed indicator decayed to '0' KIAS; ats lever tripped; yaw damper '2' tripped; engine primary N1 mode failed. All systems reset once we were clear of clouds. We then reentered the clouds and all failures immediately re-appeared. We then requested vectors to remain clear of clouds which we did not receive. Then we declared an emergency in order to remain clear of clouds. On approach after both autopilots were engaged; the number '2' autopilot failed. We continued the cat ii approach with 1 autopilot to an uneventful landing. No assistance was needed on the ground.

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Original NASA ASRS Text

Title: A300 flight crew experiences multiple pitot static system failures upon entering clouds during descent; which immediately disappear upon exiting the clouds. When clouds are entered again the scenario repeats. An emergency is declared to remain clear of clouds during vectors for approach.

Narrative: On arrival descending through approximately 16;000 FT as we entered the clouds we encountered multiple failures. First Officer airspeed indicator decayed to '0' KIAS; ATS lever tripped; yaw damper '2' tripped; engine primary N1 mode failed. All systems reset once we were clear of clouds. We then reentered the clouds and all failures immediately re-appeared. We then requested vectors to remain clear of clouds which we did not receive. Then we declared an emergency in order to remain clear of clouds. On approach after both autopilots were engaged; the Number '2' autopilot failed. We continued the cat II approach with 1 autopilot to an uneventful landing. No assistance was needed on the ground.

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.