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Deleting hard heights
Hi Can anyone tell me if there is any regulatory information that demands that information on the CDU must reflect the SID? ie Your first stop altitude is 4,000 feet hard altitude, and ATC clear you to 4,000 feet. Why not then delete the 4,000 feet hard altitude? Not an SOP or flying manual question, but a regulatory question. Is it written down somewhere by EASA CAA FAA etc Thanks in advance |
Question. Why would you? How does it improve the situation? It will reduce situational awareness in a critical phase. Regulatory? I doubt it.
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Delete away.
We almost never fly the Stars and Sid as published. A lot of direct to....
Why would Naa mikromanage such a thing?? Read what ICAO recommends , if anything. As your question is SID specific I would only be concerned about MSA , airspace restricted altitudes etc. On Stars I personalty delete altitude restrictions I know are not used to do CDA. Plenty of places , RAT this gives you a higher and safer situational awareness. ( on Stars, Approaches) PO Your SOP should cover this. ? |
Originally Posted by tonker
(Post 10130520)
Hi Can anyone tell me if there is any regulatory information that demands that information on the CDU must reflect the SID? |
If you fly an Airbus, leaving things as they are will give you a magenta reminder on the ND (if you have constraints selected). |
RAT this gives you a higher and safer situational awareness.
If you mean deleting an FMC hard altitude "gives you............." you'll have to explain that. Or am I misunderstanding what you've written? |
The coded hard altitude in the FMC database is one of the safety layers keeping you away from a level bust on departure. Can't think of any good reason why you would want it gone.
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Guys in PBN OPS You are not allowed to start changing and modifying stuff at your own convenience, there's loads of literature regarding that. Your FMC database is checked and approved by your operator following a specific protocol and it is not supposed to be modified every single sector. edit* : unless you are specifically instructed to cancel speed and altitude restrictions from ATC. |
RAT 5
Thanks, I made no sense there, Example , ILSz rwy 13 AGP the box has 5000 twice within a short distance. If deleting the first this will give ca 5800 and you are then on a higher profile. Safer!? Not relevant I suppose as we are talking SID. |
Originally Posted by BluSdUp
(Post 10130629)
Example , ILSz rwy 13 AGP the box has 5000 twice within a short distance. If deleting the first this will give ca 5800 and you are then on a higher profile. Safer!?
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There is not. You are cleared for the ILS at that point. The GS is at 5800 but has small ups and downs as there is hills reflecting the GS slightly.
But, Yes do not apply this anywhere! |
Thanks Blu.
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edit* : unless you are specifically instructed to cancel speed and altitude restrictions from ATC. Yes, I too wish they could come up with one version auto cancel or not auto cancel, I really don't care which one but just pick one and stop the individual differences :rolleyes: |
Originally Posted by tonker
(Post 10130520)
Can anyone tell me if there is any regulatory information that demands that information on the CDU must reflect the SID?
ie Your first stop altitude is 4,000 feet hard altitude, and ATC clear you to 4,000 feet. Why not then delete the 4,000 feet hard altitude? Not an SOP or flying manual question, but a regulatory question. Is it written down somewhere by EASA CAA FAA etc HOWEVER, if you are flying an RNAV SID, with authorization to do so in an OpSpec or LoA, you must follow the applicable regulations for the level of RNAV you are using. For example, if flying an RNAV1 or RNAV2 SID, you must use an autopilot or flight director. Either of those would be difficult to use without the correct information in the CDU. OTOH, you MIGHT be able to use the MCP in place of CDU altitude constraints, but why would you? |
ATC clearance cancels out SID altitude restrictions in most countries . |
If you fly a RNAV SID/STAR. You can clear the altitude constraints or speed restrictions if ATC tells you no altitude/speed restrictions. The only thing you are not allowed to do in the FMS is to add manually a waypoint. “Manual entry of SID/STAR waypoints is not permitted.” From our SOPM. |
Originally Posted by TPE Flyer
(Post 10131543)
FCOM is very clear, that clearing the SPD CST from the MCDU in NOT the recommneded procedure.
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Originally Posted by TPE Flyer
(Post 10131543)
FCOM is very clear, that clearing the SPD CST from the MCDU in NOT the recommneded procedure. Selecting the desired speed on the FCU is.
All my FCOM mentions is that if a specific speed is required, use selected. Nothing against clearing unused speed constraints, i.e. 250 below 100 if you have already accelerated. Why fly around with incorrect predictions? Either way I would not get too worked up about it. Surely you make many more alterations to the MCDU during climb and descent, like sequencing the flight plan when on vectors. That's much trickier than a simple deletion of a speed constraint. If you can't manage that.. |
Originally Posted by RAT 5
(Post 10130561)
Question. Why would you? How does it improve the situation? It will reduce situational awareness in a critical phase. Regulatory? I doubt it.
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This thread is about to turn into another SOP fist fight. Delete them as you please, just don't bust the level off. Valid for any departure, whether out of LHR or anywhere else. We've got no SOP in place that requires the hard altitudes in the FMC. |
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