Altitude deviation.

Attributes
ACN	295130
Time
Date	199501
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ela
State Reference	TX
Altitude	msl bound lower : 8700 msl bound upper : 9200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	ATR 72
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : zhu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 280 flight time total : 2100 flight time type : 500
ASRS Report	295130
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight at 230 KTS to cross gland intersection at 9000 ft. Then the controller told us to still maintain 230 KTS in the descent but to cross 8 mi southwest of gland intersection. While considering descent angles, we didn't enter the descent altitude in the afcs, we did enter the crossing altitude, 9000 ft in the GPS. We couldn't understand why the VNAV information was displaying incorrect information. Center did not give local altimeter setting. We descended below 9000 ft -- actually to 8700 ft, then climbed back to 9200 ft, then got the correct altimeter setting.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: FLT AT 230 KTS TO CROSS GLAND INTXN AT 9000 FT. THEN THE CTLR TOLD US TO STILL MAINTAIN 230 KTS IN THE DSCNT BUT TO CROSS 8 MI SW OF GLAND INTXN. WHILE CONSIDERING DSCNT ANGLES, WE DIDN'T ENTER THE DSCNT ALT IN THE AFCS, WE DID ENTER THE XING ALT, 9000 FT IN THE GPS. WE COULDN'T UNDERSTAND WHY THE VNAV INFO WAS DISPLAYING INCORRECT INFO. CTR DID NOT GIVE LCL ALTIMETER SETTING. WE DSNDED BELOW 9000 FT -- ACTUALLY TO 8700 FT, THEN CLBED BACK TO 9200 FT, THEN GOT THE CORRECT ALTIMETER SETTING.

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.