<< >> NASA ASRS Report 839110, June 2009

DA50 first officer reports erratic altitude and vertical speed indications during localizer 9R approach to ptk. A low altitude warning is issued by the tower at about the erratic indications cease; a normal landing ensued.

Attributes
ACN	839110
Time
Date	200906
Local Time Of Day	1201-1800
Place
Locale Reference	PTK.Airport
State Reference	MI
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Pitot-Static System
Person 1
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 7300 Flight Crew Type 150
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

On localizer 9R approach into pontiac airport the first officers altitude and vertical speed indicator erratically indicated a plus and minus of 400 ft and 800 FPM indications. The captains' instruments indicated normal. Pontiac tower notified us of a low altitude alert and reminded us of the approach altitude requirements. We double-checked the instruments and the erratic indications stopped. At this time the runway was insight and we continued a normal approach to a normal landing.

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Original NASA ASRS Text

Title: DA50 First Officer reports erratic altitude and vertical speed indications during LOC 9R approach to PTK. A low altitude warning is issued by the Tower at about the erratic indications cease; a normal landing ensued.

Narrative: On LOC 9R approach into Pontiac airport the First Officers altitude and vertical speed indicator erratically indicated a plus and minus of 400 FT and 800 FPM indications. The Captains' instruments indicated normal. Pontiac tower notified us of a low altitude alert and reminded us of the approach altitude requirements. We double-checked the instruments and the erratic indications stopped. At this time the runway was insight and we continued a normal approach to a normal landing.

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.