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ASN Wikibase Occurrence # 191113
Last updated: 13 November 2021
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Type:Silhouette image of generic B744 model; specific model in this crash may look slightly different
Boeing 747-419
Owner/operator:Air New Zealand
Registration: ZK-NBU
MSN: 25605/933
Fatalities:Fatalities: 0 / Occupants: 439
Other fatalities:0
Aircraft damage: None
Location:300 nm north-east of Auckland -   New Zealand
Phase: En route
Nature:Passenger - Scheduled
Departure airport:
Destination airport:
Investigating agency: TAIC New Zealand
On Wednesday 12 March 1997, at 0032 hours, Boeing 747-419 ZK-NBU was enroute from Auckland to Los Angeles as Flight NZ18. The Captain's electronic primary flight display no longer displayed flight reference information and appeared blank. An internal failure within the brake system control unit, due to water ingress, in turn caused a fault with the inertial reference unit data bus supplying information to the Captain's display. An alternate inertial reference unit was selected and it failed to supply the required information. The selection of a third inertial reference unit resolved the problem and the Captain regained his display. The two affected systems were turned off and the aircraft returned to Auckland without further incident. Safety issues discussed include the adequacy of the Quick Reference Handbook and the vulnerability of an inertial reference unit to an external fault.


Accident investigation:
Investigating agency: TAIC New Zealand
Status: Investigation completed
Download report: Final report


Photo of ZK-NBU courtesy

Melbourne (YMML / MEL)
31 December 2011; (c) Andrei Bezmylov

Revision history:

03-Nov-2016 20:09 harro Updated [Operator, Total fatalities, Other fatalities, Narrative]
08-Jun-2020 06:30 AviationFan100 Updated [Phase, Nature, Damage]
12-Aug-2020 19:50 Aviationfan100 Updated [Total occupants]

Corrections or additions? ... Edit this accident description