<< >> NASA ASRS Report 835540, May 2009

CRJ700 captain reports autopilot failed to recapture inbound course after station passage during VOR approach. Anomaly goes undetected by crew until airport is acquired visually at minimums.

Attributes
ACN	835540
Time
Date	200905
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 112 Flight Crew Total 11139 Flight Crew Type 4196
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

Loss of course guidance information from VOR while crossing the VOR on VOR approach. Autopilot was on and in use. Aircraft autopilot went in to dead reckoning mode while crossing the VOR station and never re-joined/captured the course after station passage. Obtained visual with the runway at 1300 MSL; at about the same time we noticed the aircraft was not on the approach path; and two miles from runway; corrected visually with the runway and landed. Captain had tuned and identified both navigation radios prior to commencing the approach with both voice and morse code identifiers.

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Original NASA ASRS Text

Title: CRJ700 Captain reports autopilot failed to recapture inbound course after station passage during VOR approach. Anomaly goes undetected by crew until airport is acquired visually at minimums.

Narrative: Loss of course guidance information from VOR while crossing the VOR on VOR Approach. Autopilot was on and in use. Aircraft autopilot went in to dead reckoning mode while crossing the VOR station and never re-joined/captured the course after station passage. Obtained visual with the runway at 1300 MSL; at about the same time we noticed the aircraft was not on the approach path; and two miles from runway; corrected visually with the runway and landed. Captain had tuned and identified both NAV radios prior to commencing the approach with both voice and morse code identifiers.

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.