Eurocopter Deutschland EC135T1 N522ME

Summary

On 7 November 2006 at about 08:10 local time, a Eurocopter Deutschland EC135T1 registered N522ME, operated by CJ Systems Aviation Group, was involved in an incident near Harrisburg, Pennsylvania, United States. One person was on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

7 November 2006 at 08:10

Classification

Incident

Location

Harrisburg, Pennsylvania, United States

Nearest airport

Harrisburg Hospital Heliport (5PN9)

Coordinates

40.2547, -76.8811

Aircraft

Eurocopter Deutschland EC135T1

Registration

N522ME

Category

Helicopter

Engines

2

Operator

CJ Systems Aviation Group

Operating rule

Part 91: General Aviation

Purpose of flight

Other Work Use

Phase of flight

Not recorded

Route

Harrisburg → Harrisburg

Aircraft damage

Minor

Weather

VMC

Light

Night

NTSB number

NYC07IA023

Nobody was injured.

The pilot's inadequate preflight preparation, which resulted in the cyclic stick lock not being disengaged prior to lift-off, and his subsequent inability to control the helicopter. Contributing to the accident was the operator's inadequate procedures, the unmarked cyclic lock, and the excessive breakout force required.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

After flying a patient to a rooftop hospital helipad, the medical crew and pilot decided to "hot offload" the patient (engines running). After the medical personnel and patient were unloaded, the "thumbs up" was given to the pilot verifying the helicopter's doors were secure and all equipment had been secured. The pilot then completed the before takeoff checklist. The pilot "pulled" the collective pitch lever, the helicopter became airborne, and began to "back up." He then discovered that he had forgotten to disengage the cyclic control lock mechanism after items, which had been carried on the front left seat, had been removed during the "hot offload." Fearing that the rearward movement of the helicopter may have taken him over the edge of the helipad, the pilot "immediately" lowered collective pitch, resulting in a hard landing. Examination of the incident aircraft's cyclic stick locking mechanism revealed that the locking mechanism installed on the helicopter was non-contrasting, and dark gray in color. Only three different cyclic stick locking mechanism color schemes had been produced by the manufacturer (light gray, black, or light gray with a yellow tip) and prior to the accident, a service bulletin had been issued, recommending that a yellow area be painted on the end of the older locking mechanisms to provide contrast. All aircraft produced subsequent to the service bulletin came equipped with a light gray and yellow cyclic stick locking mechanism. The cyclic stick locking mechanism was secured by means of a locking pin mounted on the underside of the instrument panel. In the event of an emergency, due to it not having been unlocked by the pilot, the locking pin was designed to be "sheared through" by a "jerky movement" of the cyclic stick, which would then allow it to move freely. The manufacturer evaluated the breakout force to be approximately 26.98 pounds of force at the stick grip. During a post incident interview, the pilot advised that he was unable to disconnect the cyclic stick locking mechanism even though he attempted to "jerk the stick." During an examination of the incident helicopter, breakout force was measured at approximately 44 pounds during one test and 42 pounds during another. Review of the operator developed checklist for the helicopter revealed that there was no reference to use of the cyclic stick locking mechanism, or inclusion of requirement to verify that the flight controls were free and correct. Additionally, the company operations manual did not address use of the cyclic stick locking mechanism during hot loading or unloading of passengers.

Quoted verbatim from the NTSB record.