NDL search misses transient loss of direct-ascent clearance after mixed-gas switches #48

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opened 2026-10-31 04:06:57 +00:00 by pedro · 1 comment

pedro commented

2026-10-31 04:06:57 +00:00

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Both ZHL-16C and ZHL-16B return no limit within 240 minutes when the current and endpoint states permit ascent, assuming monotonic clearance.

Reproduce: descend on Air to 21 m at 20 m/min, hold 30 minutes, ascend to 4.5 m at 9 m/min, then switch to Heliox 21/79 (GF high 85%). Initial NDL is null (>240 minutes); after two minutes NDL is zero and GF45/85 planning prescribes a two-minute stop at 3 m. Later clearance returns, so the endpoint shortcut misses the first boundary.

Location: src/models/zhl16c.ts noDecoLimit.

Acceptance: find the earliest loss of modeled direct-ascent clearance without assuming a monotonic predicate; regress both models, retain reference corpus agreement, and keep projection cost bounded. This is model consistency, not operational dive validation.

Both ZHL-16C and ZHL-16B return no limit within 240 minutes when the current and endpoint states permit ascent, assuming monotonic clearance. Reproduce: descend on Air to 21 m at 20 m/min, hold 30 minutes, ascend to 4.5 m at 9 m/min, then switch to Heliox 21/79 (GF high 85%). Initial NDL is null (>240 minutes); after two minutes NDL is zero and GF45/85 planning prescribes a two-minute stop at 3 m. Later clearance returns, so the endpoint shortcut misses the first boundary. Location: src/models/zhl16c.ts noDecoLimit. Acceptance: find the earliest loss of modeled direct-ascent clearance without assuming a monotonic predicate; regress both models, retain reference corpus agreement, and keep projection cost bounded. This is model consistency, not operational dive validation.

pedro referenced this issue from a commit

2026-10-31 19:24:49 +00:00

fix: find earliest transient ZHL no-stop boundary (#48)

pedro referenced this issue from a commit

2026-10-31 19:24:49 +00:00

Integrate bounded transient NDL search (#48)

pedro commented

2026-10-31 19:26:12 +00:00

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Fixed in 8d5e43b; integrated in main at 3dd512d and deployed to production (deploy run 734 succeeded; hosted assets verified against the local build). pnpm verify: 176/176 tests, offline retention, typecheck, build and release checks pass.

Fixed in 8d5e43b; integrated in main at 3dd512d and deployed to production (deploy run 734 succeeded; hosted assets verified against the local build). `pnpm verify`: 176/176 tests, offline retention, typecheck, build and release checks pass.

pedro closed this issue

2026-10-31 19:26:12 +00:00

pedro referenced this issue

2026-10-31 19:26:42 +00:00

[P2] VPM-B no-stop search checks only the current state and a 240-minute hold, so it reports no limit (>240) right before a heliox switch transient forces NDL to 0 #64