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Old 10-03-2024, 04:43 PM
  #3261  
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Originally Posted by Trip7
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The downside of IAN is the space shuttle-like approaches in hot weather, which lead to a high FOQA descent rate and long landing pings. LNAV/VNAV descent path is consistently normal.
News to me. High hot is one of the areas where IAN is specifically better than LAVS (ref Dec 23 fleet newsletter).

The primary justification to dump IAN is that so many people jack it up. Specifically, using IAN on approaches (RNP, etc) where it is not supposed to be used. And we are the only fleet to have it, so why be different.
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Old 10-03-2024, 04:47 PM
  #3262  
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Originally Posted by Sputnik
News to me. High hot is one of the areas where IAN is specifically better than LAVS (ref Dec 23 fleet newsletter).

The primary justification to dump IAN is that so many people jack it up. Specifically, using IAN on approaches (RNP, etc) where it is not supposed to be used. And we are the only fleet to have it, so why be different.
No different than the Bus where people try to do FLS on curved RNAVs.
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Old 10-03-2024, 05:48 PM
  #3263  
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Originally Posted by Trip7
Nice find. Thanks for sharing

2026 looks to be an exciting year for Delta Pilots:

MAX-10(maybe) in Q2
A350-1000 in 2H
14 more 321NEOs for NBA in Sept
Q2 of 2027*
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Old 10-03-2024, 05:53 PM
  #3264  
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Originally Posted by PilotBases
Getting a new large widebody seems exciting to me, especially 20 + options of them. As I did the math not long ago, we could have 180+ top paying jets in the fleet in a few years. (We had 31 in 2019 [Due to pre-paybanding]).
FIFY, sorta In all seriousness, does anyone have an accurate figure for the total WB's we had in 2019? That would be a relevant comparison to get the fuller picture, since there is some 'artificial' inflation of the number pre/post-paybanding.
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Old 10-03-2024, 06:38 PM
  #3265  
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Originally Posted by FangsF15
FIFY, sorta In all seriousness, does anyone have an accurate figure for the total WB's we had in 2019? That would be a relevant comparison to get the fuller picture, since there is some 'artificial' inflation of the number pre/post-paybanding.
Excluding 76-300. That’s a WB at NB pay so only those that paid WB rates.
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Old 10-03-2024, 06:58 PM
  #3266  
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Originally Posted by Sputnik
News to me. High hot is one of the areas where IAN is specifically better than LAVS (ref Dec 23 fleet newsletter).

The primary justification to dump IAN is that so many people jack it up. Specifically, using IAN on approaches (RNP, etc) where it is not supposed to be used. And we are the only fleet to have it, so why be different.
From the FCTM:
The glide path generated by the FMC is based on barometric data which is impacted by temperature deviation from ISA temperature. During approaches with temperatures above ISA, the generated IAN glide path can be slightly higher than the visual glide slope indicator path, for example from a PAPI or VASI. In these conditions, if the crew follows the visual glide slope, the airplane will be below the IAN glide path which will cause a GLIDESLOPE alert to occur.
Shot the RNAV GPS 9 the other day into MIA. 4 White when rwy was in sight. This happens often with IAN and warm destinations.
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Old 10-03-2024, 09:07 PM
  #3267  
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Originally Posted by Trip7
The downside of IAN is the space shuttle-like approaches in hot weather, which lead to a high FOQA descent rate and long landing pings. LNAV/VNAV descent path is consistently normal.
IAN and VNAV both utilize a non-compensated path, and both are subject to temperature errors.

Ref Vol.2, 11.4.6
VNAV provides vertical profile guidance through the climb, cruise, and descent phases of flight. It is an uncompensated Barometric Vertical Navigation (baro-VNAV) system.

The Airway Manual Manual 5.3.1.3.2 notes 3 and 5 talk about the uncompensated baro-VNAV and the different approach types.

Bottom line, ILS and LPV are the only approaches not affected by non-standard temperatures.
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Old 10-04-2024, 05:54 AM
  #3268  
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Originally Posted by FangsF15
FIFY, sorta In all seriousness, does anyone have an accurate figure for the total WB's we had in 2019? That would be a relevant comparison to get the fuller picture, since there is some 'artificial' inflation of the number pre/post-paybanding.
Howdy Fangs. On Dec 31, 2019 we had the following

top paying:
A350: 13
777: 18

mid widebody
A330-200/300: 42
764: 21

mid widebody+ (slightly higher rate)
A330-900:4

Not widebody:
767-300ER: 56

https://d18rn0p25nwr6d.cloudfront.net/CIK-0000027904/1fe7420e-4781-437f-92c3-08991a2d6695.pdf

Last edited by PilotBases; 10-04-2024 at 06:18 AM.
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Old 10-04-2024, 05:58 AM
  #3269  
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Originally Posted by star1007
IAN and VNAV both utilize a non-compensated path, and both are subject to temperature errors.

Ref Vol.2, 11.4.6
VNAV provides vertical profile guidance through the climb, cruise, and descent phases of flight. It is an uncompensated Barometric Vertical Navigation (baro-VNAV) system.

The Airway Manual Manual 5.3.1.3.2 notes 3 and 5 talk about the uncompensated baro-VNAV and the different approach types.

Bottom line, ILS and LPV are the only approaches not affected by non-standard temperatures.
GLS as well, but I've only actually done one in SFO. Worked great!
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Old 10-04-2024, 06:07 AM
  #3270  
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Originally Posted by PilotBases
Howdy Fangs. On Dec 31, 2019 we had the following

top paying:
A350: 13
777: 18

mid widebody
A330-200/300: 32
764: 21

mid widebody+ (slightly higher rate)
A330-900:4

Not widebody:
767-300ER: 56

https://d18rn0p25nwr6d.cloudfront.ne...991a2d6695.pdf
It looks like this is missing 10 330-300s that were heavyweights received in the 2016-18 timeframe? I thought we had 42 330s prior to any 330-900s.

Last edited by Jonny Drama; 10-04-2024 at 06:18 AM.
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