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mSparks43 / 747-400

A Boeing 747-400 aircraft for X-Plane 11 & 12
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SPEED window should not disappear when autothrottle #284

Closed Matt726-S closed 3 years ago

Matt726-S commented 3 years ago

when the autothrottle is off, the digits are blank and i’m unable to adjust the MCP speed window, making it impossible to set my v-speeds during preflight. when i turn on the autothrottle, the speed window opens and then i can set speeds.

mSparks43 commented 3 years ago

I'm reasonably sure the current setting is correct. speed window only opens when A/T is armed (on or off) and not on in VNAV without intervention.

MCCVeen commented 3 years ago

I'm reasonably sure the current setting is correct. speed window only opens when A/T is armed (on or off) and not on in VNAV without intervention.

no, the speed window should be available with autothrottle disarmed

rKsanu2MMYvypWePtQWM commented 3 years ago

I also believe the window should be blank. Do you have any proof that they shouldn't?

Matt726-S commented 3 years ago

sorry, i think i’m still too used to the 737, since you leave the autothrottle to off in that plane during startup

MCCVeen commented 3 years ago

Once again, the speed window should be available with autothrottle disarmed image

rKsanu2MMYvypWePtQWM commented 3 years ago

I've looked into the various 747 manuals and videos and noticed that basically the auto-throttle switch never leaves ARM position. Even pressing the auto-throttle disconnect switch on the throttles, the automatic functions get cancelled, but the "autothrottle remains armed" (from the FCOM). So the window should be blank when it's OFF, but it basically is never switched to OFF.

MCCVeen commented 3 years ago

I've looked into the various 747 manuals and videos and noticed that basically the auto-throttle switch never leaves ARM position. Even pressing the auto-throttle disconnect switch on the throttles, the automatic functions get cancelled, but the "autothrottle remains armed" (from the FCOM). So the window should be blank when it's OFF, but it basically is never switched to OFF.

No, the window should not be blank when it's off. The autothrottle arm switch is never disengaged because in situation where the aircraft gets close to stall speed the autothrottle will kick in. It's unnecessary to turn it off on the ground. The speed window only goes blank when FMC controls the commanded speed as is described clearly in the FCOM. If it would blank with the autothrottle arm switch turned off then the FCOM requires to mention that, which it doesn't.

rKsanu2MMYvypWePtQWM commented 3 years ago

I've looked into the various 747 manuals and videos and noticed that basically the auto-throttle switch never leaves ARM position. Even pressing the auto-throttle disconnect switch on the throttles, the automatic functions get cancelled, but the "autothrottle remains armed" (from the FCOM). So the window should be blank when it's OFF, but it basically is never switched to OFF.

No, the window should not be blank when it's off. The autothrottle arm switch is never disengaged because in situation where the aircraft gets close to stall speed the autothrottle will kick in. It's unnecessary to turn it off on the ground. The speed window only goes blank when FMC controls the commanded speed as is described clearly in the FCOM. If it would blank with the autothrottle arm switch turned off then the FCOM requires to mention that, which it doesn't.

Well then find a photo or video where the switch can be seen in OFF and the speed window is open (preferably analog speed window, not an LCD)

rKsanu2MMYvypWePtQWM commented 3 years ago

Actually I found some images myself: https://www.team-bhp.com/forum/attachments/commercial-vehicles/119600d1238758107-airplane-review-boeing-747-400-pilot-first-team-bhp-b747400-cockpit.jpg It seems the window does not blank. There was one guy who has a relative in KLM, maybe he would tell us the whole truth about it.

MCCVeen commented 3 years ago

Actually I found some images myself: https://www.team-bhp.com/forum/attachments/commercial-vehicles/119600d1238758107-airplane-review-boeing-747-400-pilot-first-team-bhp-b747400-cockpit.jpg It seems the window does not blank. There was one guy who has a relative in KLM, maybe he would tell us the whole truth about it.

that's me lol

rKsanu2MMYvypWePtQWM commented 3 years ago

Oh rip lol

mSparks43 commented 3 years ago

There is two parts to it, the window should be open when A/T is disarmed, and image AUTOTHROT DISC should display on the EICAS

MCCVeen commented 3 years ago

There is two parts to it, the window should be open when A/T is disarmed, and AUTOTHROT DISC should display on the EICAS

AUTOTHROT DISC should be displayed on the EICAS yes, but if you press the autothrottle disconnect button again on the thrust levers the eicas message will disappear

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