Master caution when rotating
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Hi folks. On every flight, when taking off and rotating I get a master warning when rotating. It only last for a split second. What am I doing wrong? Video to show what I mean: https://youtu.be/YqjXWuWUGrg
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There is only a brief look at the lower overhead panel visible in the video, but it looks like the overhead panel isn't set up correctly for a normal takeoff.
For example, the APU and GALLEY/SHED switches are both OFF, where-as they should both be ON for takeoff (the APU should be left running for takeoff as it supplies air to the PACKS. During the climb, the ENGINE AIR switches would then be switched ON to relieve the APU, and the APU can then be shutdown).
It's difficult to say without seeing the entire overhead panel, but I suspect the master caution during rotation is caused by the configuration of the air conditioning and pressurisation systems on the overhead.
For your next flight, try taking off with the APU running, APU GEN ON, APU AIR ON, PACKS 1-2 ON, and ENGINE AIR 1-4 OFF. That should also be the configuration you reach if following the checklists.
Hope that helps.
Mark - Just Flight
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I would recommend checking any enabled MWS indicator before the takeoff run and look up any you don't know, sometimes they can be very instructive.
You had engine air on (green indicator "AIR SEL ON GND" advisory on the MWS). As you take off, the weight on wheels sensor goes off and that indication goes off with it, triggering a master caution.
I'm not sure if that's intended though, according to the manual such a single chime should be reserved for a "HIGHER CATEGORY AMBER WARNING" (manual pg. 103) like when you switch the APU off. @Mark, the manual contradicts itself only a few paragraphs apart on pages 128 ("If an ENG AIR switch is selected ON when the aircraft is on the ground, a green AIR SEL ON GRND annunciator illuminates on the MWP. The ‘on ground’ condition is sensed by a squat switch.") and 130 ("If an ENG AIR switch is selected ON when the aircraft is on the ground, an amber AIR SEL ON GRND annunciator illuminates on the MWP. The ‘on ground’ condition is sensed by a squat switch."). That appears to be an editorial mistake since both cases are followed by an identical paragraph about pulling a fire handle.
The plane has a green advisory on the MWS and that should not trigger a master warning.
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@Laurreth Thanks for reporting the duplicated paragraphs in the manual. We'll get that checked over and updated in a future update.
Just as a side note, I noticed the page numbers you provided differ slightly from the manual I'm using, so that suggests you may be using a slightly out-of-date version of the manual. The latest version of the manuals can be downloaded via the following links and they should cover all the latest features in the 146:
Operations Manual: https://downloads.justflight.com/products/JFF003642/146_Professional_MSFS_manual.pdf
EFB Manual: https://downloads.justflight.com/products/JFF003642/146_Professional_MSFS_EFB_manual.pdf
UNS-1 Operations Manual: https://downloads.justflight.com/products/shared/UNS-1_FMS_MSFS_manual.pdf
Mark - Just Flight
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I made another flight last night and did everything making sure checklist was followed meticulously. Happy to say I did not get the "ding" master caution when taking off / rotating. :) I guess since I am so used to other planes turning off the APU after engine start and having packs get air from engines I didn't think it would be such an issue on the BAe 146.
This highlights the level of detail in the systems and the repercussions you get for not crossing your T's or dotting the I's. Well done Just Flight! I am chomping at the bit for your upcoming planes. Looking forward to any news you may have during the EXPO in a couple of weeks. ;) Hopefully the 747 classic news is around the corner... but I digress.
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There is a standard procedure for operating without the APU. I can publish the details if you would like?
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@A-Former-User said in Master caution when rotating:
There is a standard procedure for operating without the APU. I can publish the details if you would like?
Yes of coarse, we are all ears. :)
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Hi neinnunb.
A single chime as the main wheels leave the ground does sound like a Not in Position (NIPS) alert. Given what has previously been disclosed, it certainly sounds like an air condition switch out of position.
A see that ‘A-Former-User’ hasn’t yet posted the no APU air procedure. I will do so later today.
