N506MJ

On September 19, 2008, at 1938 eastern daylight time, an operational error occurred that resulted in a near-collision on runway 6 at the Lehigh Valley International Airport (ABE), Allentown, Pennsylvania. Mesa Air Shuttle flight 7138, a Canadair CRJ-700 carrying 56 passengers and four crew from ABE to Chicago as a scheduled 14 Code of Federal Regulations (CFR) part 121 flight, aborted takeoff because N736GV, a Cessna 172 carrying a pilot and two passengers under 14 CFR part 91, had just landed and was still taxiing on the runway near the intersection with taxiway B. The crew of ASH7138 estimated the distance between the two aircraft as 10 feet when they passed. There was no damage to either aircraft and no reported injuries. Following the incident, both aircraft taxied to parking. The crew of ASH7138 elected to cancel the flight and have the aircraft inspected. N736GV taxied to general aviation parking and concluded the flight.

N736GV was operating under visual flight rules between Caldwell, New Jersey, and ABE with the pilot and two passengers aboard. N736GV first contacted ABE tower at 1929:28, when the aircraft was about 8 miles east of the airport. The controller instructed the pilot to continue for the downwind and report midfield. At 1933:30, the pilot reported midfield for runway 6 and was cleared to land. According to recorded radar data, N736GV crossed the threshold of runway six at approximately 1936:15.

At 1934:50, ASH7138 contacted the tower to report ready for takeoff and holding short of runway 6. The controller instructed the pilot to hold short of runway 6 for landing traffic According to recorded radar data, N736GV was last seen approximately 0.6nm from the runway threshold at 1935:44. Based on an estimated ground speed of 70 knots, the aircraft crossed the runway threshold approximately 1936:15. At 1936:27, ASH7138 was instructed to taxi into and hold on the runway.

At 1936:36, the local controller asked the pilot of N736GV where the aircraft would be parking, and the pilot responded that he would be going to hangar 7. The local controller instructed the pilot to turn right at taxiway A4, taxi to hangar 7 via taxiways A and J, and remain on local control frequency.

At 1937:11, ASH7138 was instructed to fly runway heading and cleared for takeoff. Between 1937:18 and 1937:32, the controller turned his attention to another Cessna in the pattern, ensuring that the aircraft had adequate spacing and was aware of ASH7138. At 1937:34, the pilot of N736GV informed LC that the aircraft had passed taxiway A4 and asked permission to exit at taxiway B. At 1937:42, the controller responded, "...no delay, turn immediately." The pilot acknowledged.

There were no further transmissions until 1938:16 when the local controller called ASH7138. At 1938:20, ASH7138 transmitted, "We got it, tower - we're going to need to go back to the gate, ASH7138." The controller instructed the pilot to turn off at the next taxiway to the right and contact ground control. At 1939:08, the local controller asked the pilot of ASH7138 if they needed to call the tower. The pilot responded, "uh, we're going to have to, uh, the airplane was on the runway, guys, uh... we'll call you on the ground." The ground controller gave the crew the tower phone number during the taxi, and the pilot subsequently called the terminal radar approach controller-in-charge seeking information on what had occurred. The crew also notified the Mesa Airlines safety department, which contacted the Safety Board to report the incident.

Airport Information

This incident occurred on runway 6 near the intersection with runway 13/31. Runway 6 was 7600 feet long and 150 feet wide. Taxiway A4 was 1,450 feet from the threshold. Runway 13/31 crossed runway 6 at 2,700 feet from the threshold, and taxiway B intersected runway 6 at 3,100 feet from the threshold. After the incident, a runway inspection identified a set of fresh dual-tandem skid marks that appeared to have been created by ASH7138's main gear during the aborted takeoff. The marks began at 40.65114N / 075.44382W, crossed the centerline to the left, and extended approximately 1,225 feet along the left side of the runway, ending at 40.65334N / 075.44047W. Using the painted number "6" on the runway as an estimated position-and-hold point for ASH7138, the skid marks began about 2,200 feet into the takeoff roll.

Radar Data

Radar data for this accident was provided by ABE ATCT and was obtained from the ABE ASR-8 located on the airport. ABE does not have a ground movement radar system. Review of the ASR-8 radar targets showed no coverage on the aircraft surface. The last target for N736GV was detected at 1935:44 when the aircraft was 0.6nm from the runway 6 threshold and descending through 500 feet msl. There were no targets observed for ASH7138 at any time.

Personnel Interviews

Safety Board staff interviewed the two controllers on duty in the tower, the pilot of N736GV, and obtained written statements from the flight crew of ASH7138.

The local controller was hired by the FAA in September 2007, and began training at ABE tower in November 2007. He was certified on the local control position on August 12, 2008, and was also certified on the clearance delivery and flight data positions, but was not yet qualified to act as a Controller in Charge (CIC) or work any of the approach control radar positions. He stated that it was common to have developmental controllers who were not yet radar-certified assigned to a control position in the tower as long as one of the tower controllers present was qualified to act as CIC. The local controller had trained on the local control position from March 2008 to August 2008. During that time, he recalled training approximately one hour during nighttime hours. He stated that there was little to no training after sunset at ABE because of insufficient traffic. [Review of his training documentation showed that of his 81 hours training time on local control, 49 minutes were at night.] He did recall receiving a daytime airfield tour sometime during his training in order to orient himself with the airport layout, but he had never been out on the airport movement area at night.

The local controller had taken over the position about 20 minutes before the incident, and stated that he received a normal relief briefing. Just before the incident occurred, he watched N736GV on final. When the Cessna crossed the threshold, he instructed ASH7138 to position and hold on runway 6. The local controller then asked the pilot of N736GV where the wanted to park, then instructed N736GV to turn at taxiway A4 and taxi to the ramp. He stated that he thought he saw the Cessna's landing light begin to turn onto taxiway A4. The controller then turned around to locate another aircraft in the pattern, which he stated was behind the tower on left downwind. He stated that he talked to the pattern aircraft, and then turned around and scanned the runway. The runway appeared to be clear. He then cleared ASH7138 for takeoff.

The local controller did not recall actually seeing N736GV clear of the runway. After ASH7138 began its departure roll, the pilot of N736GV stated that he had passed taxiway A4 and asked to turn off on taxiway B instead. After the local controller heard the Cessna pilot state that he had missed the turn, he was looking out the tower window trying to locate the aircraft but could not find it. He finally saw the aircraft as it was approaching taxiway B, and instructed the pilot to turn immediately. When asked what he meant by that clearance, the local controller stated that he wanted the aircraft to get off the runway even if it had to turn into the grass. He then saw ASH7138 come to a stop on the runway, called the crew, but received no reply. By that time, N736GV was on taxiway B clear of runway 6. The local controller stated that he did see ASH7138 pass the Cessna on the runway, but could not estimate the distance between the two aircraft as they passed.

The local controller stated that he was standing at the LC position at the time of the incident, working without a headset and listening to transmissions through the speaker. He had to turn away from the runway to view the other traffic in the pattern, but was watching the runway when he issued the takeoff clearance to ASH7138. Asked why he did not say anything to ASH7138 during the event, he stated that he saw ASH7138 decelerating on the runway and was trained not make transmissions to pilots in a critical phase of flight. Asked what caused the incident, the local controller stated that he just "...lost the Cessna in the lights." He turned to look at his pattern traffic and looked back at the runway. When he scanned the runway, he did not see the Cessna. The controller stated that he did not feel rushed during the operation and did not feel pressured to get ASH7138 airborne.

The ground controller entered on duty with the FAA in 2001 at Grand Forks ATCT, ND, and came to Allentown tower in April 2007. When the incident occurred, he was certified on all positions in the tower including CIC, but was still training on the radar approach control positions.

The ground controller first became aware of the incident when he heard a pilot say something unusual on the local control frequency. He did not completely catch what was said, but it did not sound right. Much later, after reviewing the voice tapes, he realized that what he had heard was N736GV saying that they missed the turn at A4. The ground controller said that, as CIC, he had a general knowledge of what was going on at the time in the tower. After hearing the transmission from the speaker, he looked up and saw the lights from ASH7138 at an angle on the runway. He stated that, "...it didn't look right," but he did not know what had happened. He heard transmissions from both N736GV and ASH7138, and then called the...