A CL60 crew, on downwind to mdt, received a GPWS warning, 'terrain, terrain,' with a 'pull up' comma...

Attributes
ACN	550521
Time
Date	200206
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : mdt.tracon
State Reference	PA
Altitude	msl bound lower : 2200 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : mdt.tracon
Operator	common carrier : air carrier
Make Model Name	Challenger CL600
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : traffic pattern approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 130 flight time total : 3540 flight time type : 2150
ASRS Report	550521
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : ground less severe non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action flight crew : exited adverse environment other
Supplementary
Problem Areas	Airport Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

On the above data and time, we were operating aircraft X from cvg to mdt. The WX at harrisburg was clear skies and 10 mi visibility. Harrisburg approach cleared us for the visual to runway 31. We entered a left downwind at 2200 ft MSL (which was 1900 ft AGL). While on downwind, we received a 'terrain, terrain,' 'pull up, pull up' aural warning. We immediately initiated a climb until the aural warning disappeared. We leveled off at 3000 ft MSL. 2 mins later, we landed with no further aural warning. During the above event, harrisburg approach did not question our altitude climb from 2200 ft to 3000 ft, after being cleared for the visual. In addition, safety was not compromised, no FARS intentionally violated, and no other aircraft were in the traffic pattern.

Original NASA ASRS Text

Title: A CL60 CREW, ON DOWNWIND TO MDT, RECEIVED A GPWS WARNING, 'TERRAIN, TERRAIN,' WITH A 'PULL UP' COMMAND.

Narrative: ON THE ABOVE DATA AND TIME, WE WERE OPERATING ACFT X FROM CVG TO MDT. THE WX AT HARRISBURG WAS CLR SKIES AND 10 MI VISIBILITY. HARRISBURG APCH CLRED US FOR THE VISUAL TO RWY 31. WE ENTERED A L DOWNWIND AT 2200 FT MSL (WHICH WAS 1900 FT AGL). WHILE ON DOWNWIND, WE RECEIVED A 'TERRAIN, TERRAIN,' 'PULL UP, PULL UP' AURAL WARNING. WE IMMEDIATELY INITIATED A CLB UNTIL THE AURAL WARNING DISAPPEARED. WE LEVELED OFF AT 3000 FT MSL. 2 MINS LATER, WE LANDED WITH NO FURTHER AURAL WARNING. DURING THE ABOVE EVENT, HARRISBURG APCH DID NOT QUESTION OUR ALT CLB FROM 2200 FT TO 3000 FT, AFTER BEING CLRED FOR THE VISUAL. IN ADDITION, SAFETY WAS NOT COMPROMISED, NO FARS INTENTIONALLY VIOLATED, AND NO OTHER ACFT WERE IN THE TFC PATTERN.

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.

A CL60 crew, on downwind to mdt, received a GPWS warning, 'terrain, terrain,' with a 'pull up' command.