Segments [1, 2] ISA 1976
Segment [3] 25000 ... 60000 m NASA.
I have sanity checked this NASA [3] segment from other sources.
Observe: NASA segment [1] plunges their air planes 6.3 m in grass.
That may explain so many crashes from the Canadian series "MayDay".
Observe: typo error in the published Table III-1-4-1 a [collapsed].
If you have more to add/comment ... Please welcome.

Jean

Inst_ISA [kPa] OACI-adapted-ISA 1976 Copy.sm (556 KiB) downloaded 85 time(s).

... Thiele [0 .. 25 km] ± 1 km added.

Inst_ISA [kPa] OACI-adapted-ISA 1976.sm (600 KiB) downloaded 62 time(s).

1. Thiele refreshed.
2. Few more sanity.



Inst_ISA [kPa] OACI-adapted-ISA 1976.sm (750 KiB) downloaded 49 time(s).