N9667M

HISTORY OF FLIGHTOn October 23, 2018, about 1400 eastern daylight time, a Mooney M20C, N9667M, was destroyed when it was involved in an accident in Woodbine, New Jersey. The commercial pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

Review of the airplane’s Appareo Stratus 2S data revealed that, after takeoff, the airplane accelerated to a maximum groundspeed of about 62 knots. About 1359:19, the airplane’s altitude was about 192 ft mean sea level (msl) (about 151 ft above ground level) and the groundspeed was about 60 knots. Between 1359:19 and 1359:25, the pitch attitude increased from about 11° to about 36°, with a corresponding altitude increase and groundspeed decrease. At 1359:25, the pitch attitude began to decrease and over the next 2 seconds the airplane attained its highest altitude about 417 ft msl; about that time the groundspeed was about 26 knots. The data indicated the airplane then banked to the left, began descending, and the last data point was located near the resting position of the main wreckage. An airport security camera recorded the airplane immediately before impact and showed it in a nearly vertical nose-low, slight left-wing-low attitude with the landing gear extended.

A witness who was located at the Woodbine Municipal Airport (OBI) fuel terminal reported that the airplane taxied from there toward the approach end of runway 31; he then heard the engine power increase to a high rpm and observed the airplane begin to take off. He watched the airplane become airborne about 900 ft down the runway and begin to climb until it reached an estimated 100 ft above runway 31. He noted the airplane was in a slight climb attitude and the landing gear was retracted when the airplane was between taxiways C and D, or about 665 ft and 1,830 ft respectively, from the approach end of runway 31. He then he diverted his attention. He then heard an impact near the windsock and called 911 to report the accident. He further reported that the engine sounded steady and constant with no abnormal sounds from the time he first heard it until the impact.

A mechanic who maintained the airplane reported that he was inside a hangar at OBI when he heard the application of full takeoff power followed by the sound of an impact. He indicated that the engine sound was steady before impact. He did not hear an engine run-up but attributed that to the distance from the hangar and the hangar doors were closed. He and another individual subsequently responded to the accident site and he noted a small amount of smoke on the right side of the airplane's instrument panel. He also noted puddles of fuel on the ground with a "major puddle under the left wing."

AIRCRAFT INFORMATIONThe manually operated landing gear system was extended and retracted by means of a retracting handle assembly (“Johnson bar”) in the cabin. The system was operated by direct mechanical linkage and was aided by bungee-type springs in the fuselage and assist springs in the wing, which balance the weight of the gear. To retract the landing gear, a safety latch button on the top of the Johnson Bar is depressed and it is rapidly pushed aft from the downlock socket to the floor. The handle is then slid into the up-lock socket.

Friends of the pilot reported that within the last 1 to 2 weeks, he had expressed difficulty with the landing gear system, specifically with retracting the landing gear. One friend indicated that the pilot mentioned to him that it was easier to retract the landing gear if he did it at a slower airspeed because when he did so it took less effort. The mechanic who maintained the airplane reported that the pilot did not express that concern to him. Another friend recounted a conversation he had with another individual who reported that the pilot would hold onto something in order to brace himself and then use his other hand to operate the Johnson bar to retract the landing gear, leaving no hands to hold the control yoke.

The mechanic who performed the last annual inspection used his own checklist; as part of his inspection he did not test to determine the force required to retract the landing gear.

A review of the Mooney Aircraft Corporation 100-Hour-Annual Inspection Guide revealed that the landing gear was to be checked for operation and rigging. There was no requirement to check or determine the force required to retract the landing gear.

The airplane was equipped with a JPI engine data monitor (EDM) 700; no exceedances of the cylinder head temperature or oil temperature were recorded.

AIRPORT INFORMATIONThe manually operated landing gear system was extended and retracted by means of a retracting handle assembly (“Johnson bar”) in the cabin. The system was operated by direct mechanical linkage and was aided by bungee-type springs in the fuselage and assist springs in the wing, which balance the weight of the gear. To retract the landing gear, a safety latch button on the top of the Johnson Bar is depressed and it is rapidly pushed aft from the downlock socket to the floor. The handle is then slid into the up-lock socket.

Friends of the pilot reported that within the last 1 to 2 weeks, he had expressed difficulty with the landing gear system, specifically with retracting the landing gear. One friend indicated that the pilot mentioned to him that it was easier to retract the landing gear if he did it at a slower airspeed because when he did so it took less effort. The mechanic who maintained the airplane reported that the pilot did not express that concern to him. Another friend recounted a conversation he had with another individual who reported that the pilot would hold onto something in order to brace himself and then use his other hand to operate the Johnson bar to retract the landing gear, leaving no hands to hold the control yoke.

The mechanic who performed the last annual inspection used his own checklist; as part of his inspection he did not test to determine the force required to retract the landing gear.

A review of the Mooney Aircraft Corporation 100-Hour-Annual Inspection Guide revealed that the landing gear was to be checked for operation and rigging. There was no requirement to check or determine the force required to retract the landing gear.

The airplane was equipped with a JPI engine data monitor (EDM) 700; no exceedances of the cylinder head temperature or oil temperature were recorded.

WRECKAGE AND IMPACT INFORMATIONThe airplane crashed on airport property in grass near the departure end of runway 31 southwest of the southern edge of the runway and east of the eastern edge of runway 01/19. The main wreckage was located about 2,450 ft down runway 31 and 200 ft southwest of the southern edge of the runway 31. A ground scar associated with the left wing and broken navigation light lens was oriented on a magnetic heading of about 305°, and the empennage was oriented on a magnetic heading of about 309°.

Examination of the wreckage at the accident site revealed the airplane came to rest upright, with the empennage nearly separated near the aft wing spar. There was no evidence of fire on any portion of the airplane, although a burned electrical smell was noted in the cockpit. The source of the burned electrical smell could not be determined.

Examination of the flight controls revealed no evidence of preimpact failure or malfunction. The elevator trim jackscrew below the floor was extended 7 threads on the aft side, which correlated to take-off trim setting.

Examination of the empennage revealed a compression wrinkle on the left side, consistent with rotation to the left. An impact mark on upper portion of the tailcone corresponded to right rudder input. Impact marks on the left and right sides of the tailcone, and corresponding impact marks on the left and right elevators were examined to determine control position at impact; however, the position at impact could not be determined. An impact mark in the fairing for the vertical stabilizer and the leading edge of the vertical stabilizer was consistent with overtravel at impact.

Examination of the left wing revealed the flap and aileron remained connected at all hinge points. The leading edge exhibited full span aft crushing. The main landing gear was fully extended; the aft portion of the landing gear was driven through the wing from the aft trunnion. The retracting bungee assembly was fractured; however, the spring was not fractured.

Examination of the right wing revealed the flap and aileron remained connected at all hinge points. The leading edge exhibited full span aft crushing. The landing gear was partially extended, and the lower portion of the gear door was displaced outboard. The aft portion of the landing gear was partially driven through the wing from the aft trunnion. The retracting bungee assembly was separated, and the cylinder was bent. The spring was intact, but the cylinder rod was fractured due to bending overload. The attach block remained attached, but the attach bolt was separated.

Examination of the hydraulically operated flap control system revealed the distance of extension of the flap cylinder from the housing to the center of the attach bolt measured 3 1/16 inches. According to representatives of the airplane manufacturer, correlation with the measurement to an older B model airplane at their facility revealed it corresponded to a full flaps up configuration; however, the representative cautioned that setting may have been affected by compromise of the flap control system as a result of impact.

Examination of the cockpit revealed the Johnson Bar which was fractured from the lever assembly, was nearly vertical (towards gear down position) but was not in its downlock socket. The fracture surface did not exhibit any pre-existing cracks. Extensive impact damage to the landing gear system precluded operational testing or rigging check of the landing gear system. The nose landing gear ...