super-ofp

Interactive HTML overlay for OFPs. Converts a navtech OFP PDF into a single self-contained HTML file that looks exactly like the original — column-accurate monospaced text, all 60+ pages — and overlays a live recompute engine on top.

Fill in actuals (DISCR, TAXI, ZFW, ATA, AFU, A.RF). Every derived value — REQUESTED FUEL, TOF, TOW, EBO, LAW, UNDERLOAD, every ETA, ETOPS scenario LATEST, in-flight validity windows — shifts in real time.

This is a Claude Code skill. It's not a standalone app — it runs inside Claude Code when you reference an OFP.

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What it produces

A single <pdf-stem>.super.html file next to the source PDF:

• Pixel-faithful mirror of the original OFP (monospaced grid, OFP-native page breaks)
• Editable cells overlaid as <span contenteditable> inside <pre> — zero column drift
• Live recompute engine (~250 lines of vanilla JS, embedded)
• Image-only pages (perf charts, NOTAM maps) rendered at 120 DPI and base64-embedded
• Fully offline — no external CSS, fonts, or fetches. AirDrop-able as one file.
• Per-OFP localStorage — your filled-in values persist; each OFP keeps its own state

What gets overlaid

Area	Behaviour
Crew briefing header (p.2)	REG, DATE, flight #, DEP/ARR, CREW, OFP #, CI, ETOPS, TNK, TDV, ETD/ETA, EROPS, ALTN highlighted
DSP COMMENTS (p.3)	DOWC, EQUIPAGE, PREVI PAX (with auto J/W/Y sum), CODE CGO, MEL/CDL
Fuel & weights (p.5)	DISCR / TAXI / ZFW editable → REQUESTED FUEL, TOF, TOW, EBO, LAW, UNDERLOAD recompute live. Red when limits bust.
NAVLOG	Every waypoint gets editable A.RF, AFU, ATA. DIFF (AFU−EFU) shown red/green. ETA = ATA₀ + CTME. Late/early colour per waypoint.
ETOPS	LATEST appended per scenario. TOTAL CRITICAL DIV FUEL highlighted on the highest single-failure scenario per ETP (worst-case in-flight fuel requirement). F/R margin annotation in green/orange.
In-flight validity windows	SUITABILITY ETOPS windows recomputed live from ATA₀ + selected in-flight scenario at the bounding ETP.
Weather	DEP/ARR/OTHER labels tagged with the time of interest; TAF period tokens overlapping that time are highlighted.
Toolbar	Live late ±N min indicator (ATA₀ vs planned takeoff), Reset, Print, Share (native iOS/macOS share sheet with the filled-in snapshot).

Recompute formulas

TOF (act)        = TOF (est) + DISCR
REQUESTED FUEL   = ceil_100( TOF (est) + DISCR + TAXI )
TOW (act)        = ZFW (act) + TOF (act)
EBO (act)        = EBO (est) + (TOW act − TOW est) × (burn_coeff / 1000)
LAW (act)        = TOW (act) − EBO (act)
UNDERLOAD        = min( MZFW − ZFW,  MTOW − TOW,  MLW − LAW )

LATEST           = ATA_0 + tetp + divert + 2 min
new_window_start = orig_start + lateness
new_window_end   = orig_end   + lateness + scenario_delta

lateness = ATA₀ − (EOBT + 20). Taxi burns before V1 → affects REQUESTED FUEL only, not TOF/TOW/EBO/LAW.

In-flight scenario convention

• Planning: all 3 scenarios eligible (1EO DEPRESS, 2ENG DEPRESS, 1EO DRIFTDOWN). The one with the highest TOTAL CRITICAL DIV FUEL wins per ETP — that's the worst-case fuel requirement the margin must cover.
• In-flight: 1EO DEPRESS excluded (combined failure). Eligible = 2ENG DEPRESS and 1EO DRIFTDOWN. Highest-fuel one wins per ETP — that's what the green highlight tracks and what the recomputed validity windows use.

How to use

Inside Claude Code, just hand the model an OFP PDF and say "super ofp" — the skill auto-activates.

Or run the script directly:

python3 scripts/build_super_ofp.py path/to/your-ofp.pdf
# → path/to/your-ofp.super.html

Requirements

• Python 3 (stdlib only)
• pdftotext and pdftoppm from poppler (brew install poppler)
• The companion ofp-extract skill (bbox-based column extraction primitive). Installed automatically as a Claude Code skill alongside super-ofp.

Installation as a Claude Code skill

git clone https://github.com/aerofel/super-ofp ~/.claude/skills/super-ofp

The skill description in SKILL.md lets Claude auto-route any OFP PDF or the keywords "super ofp", "interactive ofp", "ofp overlay", "fill DISCR", "LATEST", "validity window inflight"… to this skill.

Files

super-ofp/
├── SKILL.md                       # full spec (Claude reads this)
├── README.md                      # this file
├── CHANGELOG.md                   # release notes
└── scripts/
    └── build_super_ofp.py         # single-file converter (~2k lines)

Related

• ofp-extract — bbox-based column-accurate text extraction (always used as step 1)
• dez-briefing — tabbed crew briefing summary (different output shape; use when you want a separate UI, not an OFP mirror)

License

Internal operator tooling. Not for redistribution.