ASN Wikibase Occurrence # 37387
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Tuesday 25 September 1990 |
| Time: | 10:35 |
| Type: |  Hughes 269C |
| Owner/operator: | New Horizon Aviation |
| Registration: | N1094D |
| MSN: | 600935 |
| Engine model: | LYCOMING HIO-360-D1A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Jefferson, MD -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Winchester, VA (W16) |
| Frederick, MD (FDK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
ACCORDING TO WITNESSES THE ACFT CAME APART IN THE AIR. RADAR DATA SHOWS THE ACFT AT 2600 FT WHEN IT TURNED ABOUT 35 DEGREES RIGHT IN ABOUT 4 SECONDS. THE ACFT SUSTAINED GENERAL DISINTEGATION. EXAMINATION REVEALED THAT THE SPLINES OF THE TAIL ROTOR SPLINED DRIVE SLEEVE WERE EXCESSIVELY WORN, RENDERING LOSS OF TRANSMISSION OF TORQUE TO THE TAIL ROTOR. TWO OTHER HU-269 ACFT HAD SIMILIAR WEAR OF THE SPLINED SLEEVE. 300-HR INSPECTION REQUIRES THAT THE UPPER PULLEY ASSEMBLY BE REMOVED AND INSPECTED, AND BEARINGS LUBRICATED. SCHWEIZER ACFT CORP HAD ISSUED SERVICE BULLETIN N-219 A MONTH BEFORE THE ACCIDENT WHICH REQUIRED RETORQUING OF THE SPLINE RETAINING NUT. HOWEVER, THE ACFT WAS WITHIN THE REQUIRED COMPLIANCE TIME, AND THE BULLETIN WAS NOT DONE. CAUSE: THE FAILURE OF THE TAIL ROTOR DRIVE TRANSMISSION SYSTEM DUE TO A WORN TAIL ROTOR SPLINED DRIVE SLEEVE, AND INADEQUATE MAINTENANCE AND/OR INSPECTION BY THE OPERATOR. CONTRIBUTING TO THE LOSS OF CONTROL WAS THE STUDENT PILOT'S FAILURE TO MAINTAIN ADEQUATE ROTOR RPM DUE TO INEXPERIENCE.
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X24202
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation