Altitude deviation for cpr light transport descending near mgw.

Attributes
ACN	176503
Time
Date	199104
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mgw
State Reference	WV
Altitude	msl bound lower : 23000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 4800 flight time type : 1400
ASRS Report	176503
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot altitude deviation : crossing restriction not met
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

While en route from clt to pit, washington center gave us a descent clearance to cross 30 south of mgw at 230. As per our company policy, I wrote down 20S mgw at 230 on our flight sheet, set 23000' in the altitude preselect window and read back 'leaving 290 to cross 30S morgantown at 230.' both PF and myself heard 230 restriction. While we were 32S mgw out of 23400' leveling at FL230, ATC requested our altitude. I said we were leveling at 230 an he said our restriction was 240 because he had traffic at 230. Both of us heard 230 in the aircraft, and it was read back as 230. I don't know where the conflict was at, on our end or ATC's, only listening to the tapes will tell what happened. However, if ATC did give us 240, we read back 230 and he did not correct the readback. I suspect he was looking at 230 traffic and wanted to give us 240, however, he said 230 instead of 240.

Original NASA ASRS Text

Title: ALT DEVIATION FOR CPR LTT DESCENDING NEAR MGW.

Narrative: WHILE ENRTE FROM CLT TO PIT, WASHINGTON CTR GAVE US A DSNT CLRNC TO CROSS 30 S OF MGW AT 230. AS PER OUR COMPANY POLICY, I WROTE DOWN 20S MGW AT 230 ON OUR FLT SHEET, SET 23000' IN THE ALT PRESELECT WINDOW AND READ BACK 'LEAVING 290 TO CROSS 30S MORGANTOWN AT 230.' BOTH PF AND MYSELF HEARD 230 RESTRICTION. WHILE WE WERE 32S MGW OUT OF 23400' LEVELING AT FL230, ATC REQUESTED OUR ALT. I SAID WE WERE LEVELING AT 230 AN HE SAID OUR RESTRICTION WAS 240 BECAUSE HE HAD TFC AT 230. BOTH OF US HEARD 230 IN THE ACFT, AND IT WAS READ BACK AS 230. I DON'T KNOW WHERE THE CONFLICT WAS AT, ON OUR END OR ATC'S, ONLY LISTENING TO THE TAPES WILL TELL WHAT HAPPENED. HOWEVER, IF ATC DID GIVE US 240, WE READ BACK 230 AND HE DID NOT CORRECT THE READBACK. I SUSPECT HE WAS LOOKING AT 230 TFC AND WANTED TO GIVE US 240, HOWEVER, HE SAID 230 INSTEAD OF 240.

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.