ASN Wikibase Occurrence # 284300
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| Date: | Friday 30 July 2021 |
| Time: | 15:30 LT |
| Type: |  AgustaWestland AW189 |
| Owner/operator: | Bristow Helicopters Ltd |
| Registration: | G-MCGT |
| MSN: | 92006 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | Near Heads of Ayr, South Ayrshire -
 United Kingdom
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Glasgow-Prestwick Airport (PIK/EGPK) |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a pre-fight brief for a SAR training flight, the co-pilot highlighted an event on a previous flight which had resulted in unexpected pitch oscillations following the selection of the Transition Down mode of the Automatic Flight Control System (AFCS). On the conclusion of the other training priorities for the flight, the crew replicated the circumstances that had triggered the pitch oscillations previously; this resulted in similar unexpected flight path oscillations in the pitch axis. The crew reported this second event to the operator.
The event was caused by a shortcoming in the design of the Phase 5 version of the AFCS software SAR upper modes which also resulted in incorrect AFCS mode indications to the flight crew. To address this issue pending the correction of the AFCS software in the Phase 9 release, the helicopter manufacturer issued a Technical Information Letter detailing actions to be taken in the event of a re-occurrence and updated the FMS Pilot’s Guide for Phase 5, Phase 6 and Phase 8 software. The manufacturer has corrected the design shortcoming in the Phase 9 release of the AFCS software.
Safety action has been implemented by the operator regarding automation management and incident reporting.
Accident investigation:
 |
|
Sources:
1. AAIB Final Report: https://assets.publishing.service.gov.uk/media/6329baa1e90e073725585d4d/Leonardo_AW189_G-MCGT_11-22.pdf
2. https://www.helis.com/database/cn/41441/
3. https://www.planelogger.com/Aircraft/Registration/G-MCGT/897061
4. https://en.wikipedia.org/wiki/Heads_of_Ayr
History of this aircraft
Other occurrences involving this aircraft
| 26 July 2021 | G-MCGT | Bristow Helicopters Ltd | 0 | Ballintoy Harbour, County Antrim, Northern Ireland | |
non |
Media:
The AAIB has published a report into a Leonardo AW189 (G-MCGT) experiencing unexpected pitch oscillations near Heads of Ayr on 30 July 2021.
— AAIB (@aaibgovuk) September 29, 2022
Read the report https://t.co/acElAhrXJ2#AviationSafety pic.twitter.com/j2GpNyC4f5
AgustaWestland AW189 G-MCGT at Glasgow/Prestwick 20.6.2017Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 14:35 | Dr. John Smith | Added |
| 30-Sep-2022 14:36 | Dr. John Smith | Updated [Departure airport, Embed code] |
| 16-Feb-2024 12:55 | ASN | Updated [Accident report] |
| 25-Feb-2024 09:04 | ASN | Updated [[Accident report]] |
Corrections or additions? ... Edit this accident description
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