13 Nov 2025, 01:18 [ UTC - 5; DST ]
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Post subject: Check alt annunciation Citation  Posted: 23 Dec 2018, 22:30 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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We got this yesterday in my buddy’s 501, any ideas what check alt (altitude) means ?
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Post subject: Re: Check alt annunciation Citation Posted: 23 Dec 2018, 23:01 |
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Joined: 01/31/09
Posts: 5193
Post Likes: +3038
Location: Northern NJ
Aircraft: SR22;CJ2+;C510
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You have an altitude bug or alerter? Were you more than 300’ or 1000’ off the set altitude?
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Allen
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Post subject: Re: Check alt annunciation Citation Posted: 23 Dec 2018, 23:13 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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Username Protected wrote: You have an altitude bug or alerter? Were you more than 300’ or 1000’ off the set altitude? That wasn't it. left and right and altitude and preselector all agreed.
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 00:09 |
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Joined: 02/22/11
Posts: 1250
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Company: LOCO Aviation, LLC
Location: KMRH Beaufort, NC
Aircraft: BE20, BE58, C310R
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Altimeter setting on the left and right altimeter must agree?
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Thanks MH!
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 09:21 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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Username Protected wrote: Altimeter setting on the left and right altimeter must agree? That's not it either, the one under the "check alt" is "Baro" which engages when the left and right pressure setting disagrees.
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 09:23 |
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Joined: 08/24/13
Posts: 10167
Post Likes: +4849
Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: Altimeter setting on the left and right altimeter must agree? That's not it either, the one under the "check alt" is "Baro" which engages when the left and right pressure setting disagrees.
Bingo. "Check Alt" is not a warning. "BARO" is the warning associated with the annunciator.
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 09:24 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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Username Protected wrote: The switch lettering is white. It's not a warning, just backlit lettering. The real warning will be in the bottom part of the switch.
Look in your RVSM AFMS for the purpose of the annunciator. You likely have the IS&S system. That's not it either, the one under the "check alt" is "Baro" which engages when the left and right pressure setting disagrees. But yes, good advice, I'll ask him to check his RVSM flight manual. I don't think it's IS&S though, I had one of those and I remember it having a digital altimeter readout. The button on the right toggles between the left and right air data. Another oddity of this airplane is that it apparently has GPSS but no hdg/gpss annunciator. All these old Citations are highly modified and require some "figuring out".
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 09:30 |
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Joined: 08/24/13
Posts: 10167
Post Likes: +4849
Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: The switch lettering is white. It's not a warning, just backlit lettering. The real warning will be in the bottom part of the switch.
Look in your RVSM AFMS for the purpose of the annunciator. You likely have the IS&S system. That's not it either, the one under the "check alt" is "Baro" which engages when the left and right pressure setting disagrees. But yes, good advice, I'll ask him to check his RVSM flight manual. I don't think it's IS&S though, I had one of those and I remember it having a digital altimeter readout. The button on the right toggles between the left and right air data. Another oddity of this airplane is that it apparently has GPSS but no hdg/gpss annunciator. All these old Citations are highly modified and require some "figuring out".
"Check Alt" is not a warning. It should always be lit.
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Post subject: Re: Check alt annunciation Citation Posted: 24 Dec 2018, 10:50 |
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Joined: 05/05/09
Posts: 5300
Post Likes: +5292
Aircraft: C501, R66, A36
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Thanks Terry, makes sense!
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