ASN Wikibase Occurrence # 314304
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| Date: | Thursday 23 May 2013 |
| Time: | 08:30 LT |
| Type: |  Sikorsky S-76C |
| Owner/operator: | The Queen's Helicopter Flight |
| Registration: | G-XXEB |
| MSN: | 76-0753 |
| Year of manufacture: | 2009 |
| Engine model: | Turbomeca Arriel 2S2 |
| Fatalities: | Fatalities: 0 / Occupants: 8 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | Denham Aerodrome -
 United Kingdom
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | |
| Denham Aerodrome | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During approach and descent to Denham Aerodrome, with autopilot disengaged, the pilot became aware of the aircraft yawing right. The pilot made a corrective pedal input and felt a restriction in the left pedal which also appeared to have an effect on the neutral yaw pedal position. The pilot declared a PAN and conducted an uneventful running landing. The yaw control system abnormality remained until the aircraft was shut down. The fault was later traced to the Pedal Damper Trim Actuator (PDTA). A detailed examination of the PDTA found that a small metal sealing ball had split within the solenoid valve. This caused an internal leakage of hydraulic pressure resulting in a PDTA trim runaway input and restriction within the helicopter yaw control system
Accident investigation:
 |
|
Sources:
NTSB ENG13WA028
https://assets.digital.cabinet-office.gov.uk/media/542303aeed915d1371000c59/Sikorsky_S-76C_G-XXEB_01-14.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Jun-2023 16:09 | ASN Update Bot | Added |
| 11-Jun-2023 10:15 | HanayoPlus | Updated |
| 11-Jun-2023 10:17 | harro | Updated |
Corrections or additions? ... Edit this accident description
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