ASN Wikibase Occurrence # 279570
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| Date: | Sunday 25 July 2021 |
| Time: | 20:14 UTC |
| Type: |  MD Helicopters MD 902 Explorer |
| Owner/operator: | London Air Ambulance Ltd |
| Registration: | G-LNDN |
| MSN: | 900-00125 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Between Royal London Hospital, Whitechapel, and RAF Northolt -
 United Kingdom
|
| Phase: | En route |
| Nature: | Ambulance |
| Departure airport: | Royal London Hospital, Whitechapel, London |
| London-Northolt RAF Station (NHT/EGWU) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
AAIB investigation to MD Helicopters MD 902 Explorer, G-LNDN: Various electrical system faults due to water ingress, in flight between the Royal London Hospital in Whitechapel, London and RAF Northolt, South Ruislip, Greater London, on 25 July 2021. The AAIB Final Report was published on 23 June 2022, and the following is the summary from that report:
"During a flight from the Royal London Hospital to RAF Northolt, G-LNDN suffered a series of seemingly unconnected electrical system faults.
The first faults related to the stability augmentation system and the commander’s flight instrument displays but did not materially affect the conduct of the flight. Later, when approximately 4 nautical miles from their destination, the pilots were alerted to electronic engine control system fault indications for both engines. A ‘critical’ fault on the right engine required the pilots to manually control its throttle but the fault on the left engine was non-critical and the engine operated as expected in the NORMAL (automatic) control mode. The pilots were able to complete an uneventful approach and landing at RAF Northolt.
The investigation found that the electrical failures were the result of water ingress from the right engine bay onto electronic components located in the rear fuselage area.
=Damage Sustained to Airframe=
Water damage to Symbol Generator and right Electronic Engine Controller"
Sources:
1. AAIB Final Report: https://assets.publishing.service.gov.uk/media/629f52a58fa8f5039360fe29/MD_900_G-LNDN_07-22.pdf
2. https://www.londonsairambulance.org.uk/about-us/our-fleet
3. https://helihub.com/2016/01/25/second-explorer-for-londons-air-ambulance-now-test-flying/
4. https://en.wikipedia.org/wiki/Royal_London_Hospital
Media:
An MD 900 (G-LNDN) suffered a series of electrical system faults. The electrical failures were the result of water ingress.
— AAIB (@aaibgovuk) June 23, 2022
Read the report: https://t.co/ItYDKAjPAM pic.twitter.com/LjbXhdcw9G
.jpg)
G-LNDN Explorer MD900 Helicopter London's Air Ambulance Ltd at Gloucestershire Airport, 16 September 2016
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Jun-2022 22:15 | Dr. John Smith | Added |
| 25-Jun-2022 01:24 | Dr. John Smith | Updated [Total fatalities, Location, Departure airport, Embed code] |
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