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Ingvarr 11th Oct 2019 15:55

RVSM
 
Hi colleges! What is yours regulation, when you have FL352 and 358 in RVSM at the same route opposite direction? Thank you!

SThor 11th Oct 2019 18:55


Originally Posted by Ingvarr (Post 10592092)
Hi colleges! What is yours regulation, when you have FL352 and 358 in RVSM at the same route opposite direction? Thank you!

Well, technically both examples should be within the limits for their assigned levels.

“(c) Altitude-keeping equipment: All aircraft. To approve an aircraft group or a nongroup aircraft, the Administrator must find that the aircraft meets the following requirements:
(1) The aircraft must be equipped with two operational independent altitude measurement systems. (2) The aircraft must be equipped with at least one automatic altitude control system that controls the aircraft altitude—
(i) Within a tolerance band of ±65 feet about an acquired altitude when the aircraft is operated in straight and level flight under nonturbulent, nongust conditions; or
(ii) Within a tolerance band of ±130 feet under nonturbulent, nongust conditions for aircraft for which application for type certification occurred on or before April 9, 1997 that are equipped with an automatic altitude control system with flight management/performance system inputs.
(3) The aircraft must be equipped with an altitude alert system that signals an alert when the altitude displayed to the flight crew deviates from the selected altitude by more than:
(i) ±300 feet for aircraft for which application for type certification was made on or before April 9, 1997; or
(ii) ±200 feet for aircraft for which application for type certification is made after April 9, 1997.”

https://www.icao.int/safety/fsix/Lib...to_Part-91.pdf

If certified after April 9 1997, keeping within 200’ is maintaining...

DTY/LKS 14th Oct 2019 15:07

Technically separated so nothing needing done but would still feel uneasy as you need either 1000’ or 5nm (which you wouldn’t have!)

jmmoric 24th Oct 2019 12:20

Procedural separation :ok:

No honestly, if they are both maintaining their assigned flightlevel, you should be able to disregard the mode C presentation, which you'd have them turn off anyway if the presentation is "out of the required margin".

If feeling uneasy about it, just get a confirmation on the pressure settings and level...

The hick-up comes when their TCAS starts reacting, cause as far as I know, they will see another aircraft 600 feet above/below, not the 1000 feet that there actually is, since the TCAS is working on mode C, so be ready for a question unless you've adviced them before they pass each other.

Been there, done that.


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