<< >> NASA ASRS Report 444460, July 1999

A B727 flight crew, operating on a ferry permit, received a report from ZOB that the altitude readout differed from aircraft's actual altitude.

Attributes
ACN	444460
Time
Date	199907
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : ape.vortac
State Reference	PA
Altitude	msl single value : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 95 flight time total : 10600 flight time type : 4610
ASRS Report	444460
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	atc equipment other atc equipment : mode c other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Flight abc, B727-200, part 91, in cruise at FL230, ZOB reported altitude near FL260 (not sure) and climbing. All aircraft altimeters showed in level cruise at FL230. Part 91 ferry osc-mia.

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Original NASA ASRS Text

Title: A B727 FLC, OPERATING ON A FERRY PERMIT, RECEIVED A RPT FROM ZOB THAT THE ALT READOUT DIFFERED FROM ACFT'S ACTUAL ALT.

Narrative: FLT ABC, B727-200, PART 91, IN CRUISE AT FL230, ZOB RPTED ALT NEAR FL260 (NOT SURE) AND CLBING. ALL ACFT ALTIMETERS SHOWED IN LEVEL CRUISE AT FL230. PART 91 FERRY OSC-MIA.

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.