ASN Wikibase Occurrence # 366959
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| Date: | Tuesday 21 November 2017 |
| Time: | 01:31 UTC |
| Type: |  ATR 72-600 |
| Owner/operator: | Wings Abadi Airlines |
| Registration: | PK-WHS |
| MSN: | 1307 |
| Fatalities: | Fatalities: 0 / Occupants: 66 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Namp Island -
 Indonesia
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Sumbawa Besar-Brang Bidji Airport (SWQ/WADS) |
| Lombok International Airport (LOP/WADL) | |
| Investigating agency: | NTSC |
| Confidence Rating: |  Accident investigation report completed and information captured |
Wings Air flight IW1861, an ATR 72-600 and a Cessna 172S (PK-BYK) were involved in an airprox incident near Namp Island, Indonesia.
The Cessna was being operated by Balai Pendidikan dan Pelatihan Penerbangan Banyuwangi (BP3B) on a cross country training flight from Blimbingsari Airport (WADY), Banyuwangi to Sultan Muhammad Kaharuddin airport (WADS), Sumbawa Besar.
PK-BYK with two student pilots on board departed from WADY with intention to cruise at altitude of 7,000 feet and
when approaching point KUBU TAMBAHAN, PK-BYK requested to Bali approach controller to climb to altitude of 9,000 feet which was approved.
At the same time, the an ATR 72-600 had departed from WADS with cruising altitude of 8,000 feet. The Pilot in Command (PIC) acted as PM and the Second in Command (SIC) acted as PF.
When PK-BYK was approaching point NAMP ISLAND, the Cessna's PF saw an ATR 72-600 aircraft flying through clouds from the opposite direction with the aircraft nose slightly up. The PF of PK-BYK assumed that the ATR 72-600 aircraft was climbing, so he decided to descend with the intention to avoid the ATR 72-600 aircraft.
The separation of both aircraft reduced to below minima when the PK-BYK pilot left 9000 feet at 01:31:40 UTC, the distance of both aircraft was 4.7 nm and continued reducing to a horizontal distance of 2 nm.
Both flights continued their flight to the destination safely.
Contributing Factors
The assumption of ATR72-600 on climbing and not aware of the right of way rules resulted in the PK-BYK pilot decided to descend aircraft for traffic avoidance.
Accident investigation:
 |
|
Sources:
https://bea.aero/en/investigation-reports/notified-events/detail/serious-incident-to-the-atr72-registered-pk-whs-operated-by-wings-air-and-to-the-cessna-172-registered-pk-byk-on-21-11-2017-en-route-investigation-led-by-par-ntsc---indonesia/
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Mar-2024 18:19 | ASN | Added |
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