An air carrier B757 first officer reports that his crew may have had an altitude deviation. He also complains about the HSI heading presentation of the B757 as compared to the B737. There must also have been a track heading deviation while holding.

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Attributes
ACN	351860
Time
Date	199610
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5400
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : private
Experience	flight time last 90 days : 180 flight time total : 5000 flight time type : 1800
ASRS Report	351860
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At the end of a long day, the PF misinterpreted his HSI heading which I pointed out resulting in confusion and a possible altitude deviation of 400 ft. Contributing factors, excessive xwinds at altitude making the display confusing. Hold problem arose (different heading display on the new HSI's (B757) versus the old HSI's (ie, 737's). Human factors, long day.

Original NASA ASRS Text

Title: AN ACR B757 FO RPTS THAT HIS CREW MAY HAVE HAD AN ALTDEV. HE ALSO COMPLAINS ABOUT THE HSI HEADING PRESENTATION OF THE B757 AS COMPARED TO THE B737. THERE MUST ALSO HAVE BEEN A TRACK HEADING DEV WHILE HOLDING.

Narrative: AT THE END OF A LONG DAY, THE PF MISINTERPRETED HIS HSI HEADING WHICH I POINTED OUT RESULTING IN CONFUSION AND A POSSIBLE ALTDEV OF 400 FT. CONTRIBUTING FACTORS, EXCESSIVE XWINDS AT ALT MAKING THE DISPLAY CONFUSING. HOLD PROB AROSE (DIFFERENT HEADING DISPLAY ON THE NEW HSI'S (B757) VERSUS THE OLD HSI'S (IE, 737'S). HUMAN FACTORS, LONG DAY.

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.