Swiss B773 near Zurich on Jun 23rd 2018, dangerous loss of separation

Last Update: December 22, 2023 / 17:56:26 GMT/Zulu time

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Incident Facts

Date of incident
Jun 23, 2018

Classification
Incident

Flight number
LX-93

Aircraft Registration
HB-JNB

Aircraft Type
Boeing 777-300

ICAO Type Designator
B773

A Swiss International Airlines Boeing 777-300, registration HB-JNB performing flight LX-93 (dep Jun 22nd) from Sao Paulo Guarulhos,SP (Brazil) to Zurich (Switzerland) with 341 passengers and 3 flight crew, was descending through about 5900 feet MSL about 15nm northwest of Zurich Airport when the crew initiated a climb of more than 1600 fpm above 6200 feet MSL due to a TCAS advisory. The aircraft continued the approach, intercepted the localizer runway 14 and landed safely about 7 minutes later.

On Aug 10th 2018 Switzerland's SUST reported the occurrence was rated a serious incident and is being investigated. The Boeing 777-300 came into dangerous proximity to a motor aircraft performing aerobatics.

On Dec 22nd 2023 the SUST released their final factual report in German only without conclusions stating, that the light aircraft had accelerated while descending to 4100 feet and then performed a looping that took the aircraft up to 4900 feet, while the Boeing 777 was being vectored for approach at 6000 feet MSL. The Boeing received a TCAS Traffic Advisory shortly followed by a Resolution Advisory to climb, climbed about 400 feet as result of the resolution advisory. The SUST commented in their analysis that the performance of aerobatics below a TMA, where aircraft are vectored for approach at 6000 feet, demonstrates low understanding of the general situation.
Aircraft Registration Data
Registration mark
HB-JNB
Country of Registration
Switzerland
Date of Registration
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Certification Basis
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Airworthyness Category
Legal Basis
TCDS Ident. No.
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Manufacturer
THE BOEING COMPANY
Aircraft Model / Type
777-3DEER
ICAO Aircraft Type
B77W
Year of Manufacture
Serial Number
Aircraft Address / Mode S Code (HEX)
Max. Operational Passenger Seating Capacity (MOPSC), indicative
Minimum Crew
Maximum Take off Mass (MTOM) [kg]
Engine Count
Engine
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Main Owner
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Main Operator
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Incident Facts

Date of incident
Jun 23, 2018

Classification
Incident

Flight number
LX-93

Aircraft Registration
HB-JNB

Aircraft Type
Boeing 777-300

ICAO Type Designator
B773

This article is published under license from Avherald.com. © of text by Avherald.com.
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