<< >> NASA ASRS Report 402070, May 1998

Light transport cpr aircraft in descent for approach, reporter pilot descended below assigned. Autoplt didn't capture the altitude, but apparently the reporter didn't notice until approach controller told him to get back on altitude due to traffic.

Attributes
ACN	402070
Time
Date	199805
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hou
State Reference	TX
Altitude	msl bound lower : 3300 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : hou
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 18000 flight time type : 570
ASRS Report	402070
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was being vectored for ILS approach and had been cleared to 3000 ft from 5000 ft and was called and told to stop at 4000 ft and the autoplt did not capture altitude. At the same time I hit turbulence, control called and said to get back to 4000 ft because of traffic at 3000 ft. I climbed back to 4000 ft and hand-flew the rest of the approach. The aircraft and autoplt will be sent to maintenance.

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Original NASA ASRS Text

Title: LTT CPR ACFT IN DSCNT FOR APCH, RPTR PLT DSNDED BELOW ASSIGNED. AUTOPLT DIDN'T CAPTURE THE ALT, BUT APPARENTLY THE RPTR DIDN'T NOTICE UNTIL APCH CTLR TOLD HIM TO GET BACK ON ALT DUE TO TFC.

Narrative: WAS BEING VECTORED FOR ILS APCH AND HAD BEEN CLRED TO 3000 FT FROM 5000 FT AND WAS CALLED AND TOLD TO STOP AT 4000 FT AND THE AUTOPLT DID NOT CAPTURE ALT. AT THE SAME TIME I HIT TURB, CTL CALLED AND SAID TO GET BACK TO 4000 FT BECAUSE OF TFC AT 3000 FT. I CLBED BACK TO 4000 FT AND HAND-FLEW THE REST OF THE APCH. THE ACFT AND AUTOPLT WILL BE SENT TO MAINT.

Data retrieved from NASA's ASRS site as of July 2007 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.