C152 and advertising lighter than air blimp had near midair collision.

Attributes
ACN	449805
Time
Date	199809
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : agc.airport
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : agc.tower
Operator	general aviation : instructional
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	ground : takeoff roll
Route In Use	departure : vfr
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : agc.tower
Operator	general aviation : corporate
Make Model Name	Balloon
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Person 1
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Experience	flight time last 90 days : 30 flight time total : 130 flight time type : 120
ASRS Report	449805
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On final for touch-and-go runway 28 at agc, when blimp to the north of runway requests departure to city, after confirming north departure, tower clears blimp to depart. Blimp is facing runway (south), however, as we touched down, blimp turns north, but ends up over runway (because of large radius turn) while we are on runway. We are forced to keep plane low because it is too late to abort but we are under blimp.

Original NASA ASRS Text

Title: C152 AND ADVERTISING LIGHTER THAN AIR BLIMP HAD NMAC.

Narrative: ON FINAL FOR TOUCH-AND-GO RWY 28 AT AGC, WHEN BLIMP TO THE N OF RWY REQUESTS DEP TO CITY, AFTER CONFIRMING N DEP, TWR CLRS BLIMP TO DEPART. BLIMP IS FACING RWY (S), HOWEVER, AS WE TOUCHED DOWN, BLIMP TURNS N, BUT ENDS UP OVER RWY (BECAUSE OF LARGE RADIUS TURN) WHILE WE ARE ON RWY. WE ARE FORCED TO KEEP PLANE LOW BECAUSE IT IS TOO LATE TO ABORT BUT WE ARE UNDER BLIMP.

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.