An IFR C172 pilot departed gai after receiving his ATC clearance but failed to make the recommended ...

Narrative:

After loading and securing all 3 passengers and luggage; I started the plane and proceeded to taxi to the end of runway 14. I performed my preflight checks and called clearance delivery to get my clearance. I received my clearance and was told to call back when I was number one for takeoff. I taxied up to the stop line at the end of runway 14 and looked down the runway and in the air for any approaching traffic. I did not see any traffic in the area; so I called potomac for and received my takeoff clearance. With all of the coordination required with potomac controllers; I forgot to announce on the CTAF that I was about to takeoff on runway 14. I lined up on runway 14 and started my takeoff roll. About halfway through my takeoff roll; I saw a single engine; aerobatic looking plane enter the opposite end of the runway from a taxiway. I was surprised; since I was already taking off; but since the runway is over 4;000 ft and I would need less than 2;000 ft to takeoff I did not consider the plane's movement onto the runway as hazardous. I was thinking that the plan would either cross the runway; or at worst; line up to takeoff; see me fast approaching and stay still until I was clear of the area. Then the unthinkable happened. A split second before I rotated to liftoff; I noticed that the plane started to move towards me; as if to takeoff on runway 32. Once I lifted off; I could no longer see the other plane due to the climb attitude of my plane. I was still nervous about the location of the other plane at this point; but again thought that they would see me climbing towards them and would not continue their takeoff run. As I climbed through approximately 50 ft above the runway; still on the runway heading; I saw the other plane passing beneath me and to the left in a sharp right turn no more than 30 ft to 40 ft away from me. I immediately turned to the right to increase our distance away from each other. My clearance took me towards the north; so I continued my turn and never saw the other plane again.after a few days to reflect on the above near miss; I realized a few things that I could have done better. First of all; I should not have forgotten to self announce and listen to the CTAF. Second; when I first saw the plane enter the runway; I could have safely aborted the takeoff and exited the runway in time to avoid the conflict. Finally; after liftoff; I could have initiated a right turnout immediately so that in case the other plane did continue their takeoff; I would no longer be directly over the runway. Unfortunately; I never imagined that a pilot would initiate a takeoff on a runway at the same time I was about to liftoff going in the opposite direction! The weather was clear and the visibility was excellent; so I cannot imagine that the other pilot did not see me when he was facing me and started his takeoff roll.

Original NASA ASRS Text

Title: An IFR C172 pilot departed GAI after receiving his ATC clearance but failed to make the recommended CTAF movement calls. During takeoff another aircraft entered and departed the runways opposite end resulting in a NMAC of about 30 FT.

Narrative: After loading and securing all 3 passengers and luggage; I started the plane and proceeded to taxi to the end of Runway 14. I performed my preflight checks and called Clearance Delivery to get my clearance. I received my clearance and was told to call back when I was number one for takeoff. I taxied up to the stop line at the end of Runway 14 and looked down the runway and in the air for any approaching traffic. I did not see any traffic in the area; so I called Potomac for and received my takeoff clearance. With all of the coordination required with Potomac Controllers; I forgot to announce on the CTAF that I was about to takeoff on Runway 14. I lined up on Runway 14 and started my takeoff roll. About halfway through my takeoff roll; I saw a single engine; aerobatic looking plane enter the opposite end of the runway from a taxiway. I was surprised; since I was already taking off; but since the runway is over 4;000 FT and I would need less than 2;000 FT to takeoff I did not consider the plane's movement onto the runway as hazardous. I was thinking that the plan would either cross the runway; or at worst; line up to takeoff; see me fast approaching and stay still until I was clear of the area. Then the unthinkable happened. A split second before I rotated to liftoff; I noticed that the plane started to move towards me; as if to takeoff on Runway 32. Once I lifted off; I could no longer see the other plane due to the climb attitude of my plane. I was still nervous about the location of the other plane at this point; but again thought that they would see me climbing towards them and would not continue their takeoff run. As I climbed through approximately 50 FT above the runway; still on the runway heading; I saw the other plane passing beneath me and to the left in a sharp right turn no more than 30 FT to 40 FT away from me. I immediately turned to the right to increase our distance away from each other. My clearance took me towards the north; so I continued my turn and never saw the other plane again.After a few days to reflect on the above near miss; I realized a few things that I could have done better. First of all; I should not have forgotten to self announce and listen to the CTAF. Second; when I first saw the plane enter the runway; I could have safely aborted the takeoff and exited the runway in time to avoid the conflict. Finally; after liftoff; I could have initiated a right turnout immediately so that in case the other plane did continue their takeoff; I would no longer be directly over the runway. Unfortunately; I never imagined that a pilot would initiate a takeoff on a runway at the same time I was about to liftoff going in the opposite direction! The weather was clear and the visibility was excellent; so I cannot imagine that the other pilot did not see me when he was facing me and started his takeoff roll.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	880332
Time
Date	201003
Local Time Of Day	1201-1800
Place
Locale Reference	GAI.Airport
State Reference	MD
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Takeoff Initial Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	Taxi Takeoff Climb
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 32 Flight Crew Total 1175 Flight Crew Type 1091
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy

An IFR C172 pilot departed gai after receiving his ATC clearance but failed to make the recommended CTAF movement calls. During takeoff another aircraft entered and departed the runways opposite end resulting in a near midair collision of about 30 ft.