Serious incident Gulfstream IV N146BG, Friday 22 May 2020

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Date:	Friday 22 May 2020
Time:	20:00
Type:	Gulfstream IV
Owner/operator:	Prime Jet, LLC
Registration:	N146BG
MSN:	1146
Year of manufacture:	1990
Fatalities:	Fatalities: 0 / Occupants:
Other fatalities:	0
Aircraft damage:	None
Category:	Serious incident
Location:	120 km SW of Tokyo International Airport/Haneda (HND/RJTT) - Japan
Phase:	En route
Nature:	Unknown
Departure airport:	Phnom Penh-Pochentong Airport (PNH/VDPP)
Destination airport:	Tokyo-Haneda Airport (HND/RJTT)
Investigating agency:	JTSB
Confidence Rating:	Information verified through data from accident investigation authorities

Narrative:
A Gulfstream IV business jet departed from Phnom Penh at 05:43 UTC. When G-IV was cruising at FL450 at 120 km southwest of Tokyo/Haneda at 10:50 UTC (19:50 Japan Standard Time: JST), the air speed indications of PIC and F/O disagreed. The flight crew dealt the situation by identified the correct instrument. At 11:00 UTC (20:00 JST), the air speed indication became abnormal. The crew declared an emergency, and continued the flight with a stand-by air speed indicator. The Gulfstream landed at Tokyo/Haneda at 11:30 UTC (20:30 JST) without further trouble. No injuries were reported.

Accident investigation: