NZ60 Erronious ILS Incident, Apia

An Air New Zealand 767 encounters a malfunctioning ILS Glideslope system which forces it to go around. A saftey instructional video discusses the event and the ramifications regarding the operation and use of the Instrument Landing System

Category:

Howto & Style

Tags:

• NZ60
• 767
• B767
• ILS
• plane
• flying
• aircraft
• 767-300
• Glideslope
• flight
• incident
• system
• failure
• nz60
• new
• zeland

[FSX09pilot]

How do pilots maintain glide slope? do they use yokes or trim?

[musicalaviator]

@FSX09pilot In this particular case they used the APP mode of the autopilot, obviously down to below 800ft as LAND3 was activated by the autopilot in the latter part of the decent. The autopilot would use Trim to adjust decent rate. If it was being flown manually, the pilot would use a combination of Yoke, Trim and Throttle to adjust decent rate and pitch.

[musicalaviator]

To whoever "Spam Marked" the spam... many thanks :)

[NZtegmen]

doesnt answer the question, as to why the crew placed total reliance on an ils dme approach when they knew it was un-monitored before they left the ground?

[musicalaviator]

So you suggest they should do what? a non-precision VOR approach even when theyre recieving Ident and 'on path and slope' indications with the Autopilot accepting land3? They were slightly suspicious of the ILS which is why they monitored the ident all the way down. *beeps in headset all approach.*ILS use would be normal here with 'caution' (ie monitoring DME and Ident and doing DME/Height checks)

[FSX09pilot]

@musicalaviator thanks for the quick response

[Kg277]

90 and 150 hootz

[CoolassVibe]

@NZtegmen, you're right. Although... Im not a pilot (ILS Tech), but in the past when I NOTAMed the ILS "un-monitored" it was because a communication line sending monitored signal back to the tower and maint was cut, hence ILS unmonitored. The actual ILS air borne signal was perfect. This was verified at the actual sites. His Glideslope was left radiating Hazardous Misleading Information HMI, a big no no in the FAA.

[CoolassVibe]

@pasoundman, speaking as ILS tech, the monitors are there to detect such absence. The tech obviously engaged the monitor bypass feature and readiated HMI and walked away from the system. This is something I would ONLY do if I completely NOTAM the GS out of service. Even then I would dummy load the air borne signal just in case. In the case where a normal signals loses its SBO (90 and 150) the transmitter would immediately shut itself off.

[Avantime]

I've seen someone tie the windsock to a rock on the ground so that the pilots think the wind is calm and land instead of diverting.

It happened in PNG, and yes it was a true story.

[pepefone]

Thank you very much for the video!!!!

[pasoundman]

Scrub that. I misunderstood the nature of the fault slightly on first viewing.