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767 Captain II (P3D4) >> 767 Captain II - Wish list  >> Approach Idle
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Message started by Alex T on Jul 11th, 2021 at 3:46pm

Title: Approach Idle
Post by Alex T on Jul 11th, 2021 at 3:46pm
Any chance approach idle can be modeled for the 757/767? 5 seconds after touchdown it goes back down to ground idle from approach idle. Also a better number for the RB211 min_throttle_limit would be around -0.40 to simulate an accurate max reverse N1, but the issue is that the takeoff config goes off when I changed this number. Is it possible to code a logic that doesn't allow takeoff config to go off when engines are in reverse?

Title: Re: Approach Idle
Post by Alex T on Jul 11th, 2021 at 3:49pm
RB211:

IDLE SELECTION
There are two engine idle speeds: minimum and approach idle. The fuel control
unit selects these idle speeds automatically. Minimum idle is a lower thrust than
approach idle and selected for ground operation and all phases of flight except
approach and landing. Approach idle is activated when engine anti-ice is on, or
when the trailing edge flaps are extended beyond position 20. Approach idle is
maintained until 5 seconds after touchdown to provide better engine acceleration
for go-around or reverse thrust. After a 5 second delay following touchdown, the
engines decelerate to minimum idle to minimize landing distance.

PW2000:

IDLE SELECTION
There are three engine idle speeds: ground minimum idle, inflight
minimum idle, and approach idle. The fuel control unit selects these idle speeds
automatically. Ground minimum idle is a lower thrust than inflight minimum
idle and selected for ground operations. Inflight minimum idle is a lower thrust
than approach idle and is for most phases of flight. Approach idle is activated
when engine anti-ice is on, or when the trailing edge flaps are extended beyond
position 20. Approach idle is maintained until 5 seconds after touchdown to
provide better engine acceleration for go-around or reverse thrust. After the
5-second delay following touchdown, the engines decelerate to ground idle to
minimize landing distance.

PW4000:

There are two engine idle speeds: minimum idle and approach idle.
Minimum idle is a lower thrust than approach idle and selected for ground
operation and all phases of flight except approach and landing. Approach idle is
selected whenever this higher idle setting is required for proper system operation.
Approach idle is activated when engine anti-ice is on, or when the trailing edge
flaps are extended beyond position 20. Approach idle is maintained until 5
seconds after touchdown. The EEC selects these idle speeds automatically.
The EICAS advisory message L or R ENG LOW IDLE displays to indicate an
engine failed to go to approach idle.
The EICAS advisory message IDLE DISAGREE displays to indicate the engines
are at different idle settings. Either one engine has failed to go to approach
idle when required or one engine has failed to return to minimum idle. Inflight,
to ensure that approach idle is available if required, the thrust lever on the
engine with the lower RPM should be advanced to match the engine with the
higher RPM.

Rotating the ENGINE START selectors to CONT also selects
approach idle.

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