Every number, checked against the handbook it came from.

Taxiway Bravo works out takeoff distance, climb, cruise and weight and balance from each aircraft's own digitized handbook. This page lists the handbooks our engine is proven against, the ones it is not yet, and how the proof is made. Every figure on it is produced by the test run itself, so it cannot fall out of date.

Checks passing: 3,374; in 23 suites

Handbooks verified: 5; of 6 on the shelf

Not yet verified: 2; named below

Failures: 0; numbers publish only at zero

Handbook by handbook

Verified means a suite gives the engine the inputs of the handbook's printed performance tables and the engine returns the printed values. A table the handbook only publishes as a graph is not tabulated, and its calculator stays off rather than guessing.

Bundled handbooks and their verification
Handbook	Year	Published tables	Engine suite	Checks	Status
Cessna 172H SkyhawkShowcase, not offered for a tail	1967	Takeoff, Landing, Climb, Cruise, Stall, Glide	`test:poh` Suite shared with 172L	403	Verified
Mooney M20F Executive 21	1967	Takeoff, Landing, Climb, Cruise, Stall, Glide	`test:poh-mooney`	454	Verified
Cessna 172L Skyhawk	1971	Takeoff, Landing, Climb, Cruise, Stall Not tabulated: glide	`test:poh` Suite shared with 172H	Counted with 172H	Verified
Cessna 172N Skyhawk	1977	Takeoff, Landing, Climb, Cruise, Stall Not tabulated: glide	`test:poh-gama` Suite shared with 172P	1,417	Verified
Cessna 172P Skyhawk	1982	Takeoff, Landing, Climb, Cruise, Stall, Glide	`test:poh-gama` Suite shared with 172N	Counted with 172N	Verified
Piper PA-28-161 Warrior II	1982	Glide Not tabulated: takeoff, landing, climb, cruise, stall	No table suite Limits only, in `test:poh-engine`	—	Not yet verified

Cessna 172H SkyhawkShowcase, not offered for a tail
Verified
Year
1967
Published tables
Takeoff, Landing, Climb, Cruise, Stall, Glide
Engine suite
test:poh
Suite shared with 172L
Checks
403
Mooney M20F Executive 21
Verified
Year
1967
Published tables
Takeoff, Landing, Climb, Cruise, Stall, Glide
Engine suite
test:poh-mooney
Checks
454
Cessna 172L Skyhawk
Verified
Year
1971
Published tables
Takeoff, Landing, Climb, Cruise, Stall
Not tabulated: glide
Engine suite
test:poh
Suite shared with 172H
Checks
Counted with 172H
Cessna 172N Skyhawk
Verified
Year
1977
Published tables
Takeoff, Landing, Climb, Cruise, Stall
Not tabulated: glide
Engine suite
test:poh-gama
Suite shared with 172P
Checks
1,417
Cessna 172P Skyhawk
Verified
Year
1982
Published tables
Takeoff, Landing, Climb, Cruise, Stall, Glide
Engine suite
test:poh-gama
Suite shared with 172N
Checks
Counted with 172N
Piper PA-28-161 Warrior II
Not yet verified
Year
1982
Published tables
Glide
Not tabulated: takeoff, landing, climb, cruise, stall
Engine suite
No table suite
Limits only, in test:poh-engine
Checks
—

Not yet verified

These handbooks are digitized but no suite yet reproduces their printed tables. We list them so you never have to infer a gap from what is missing.

Piper PA-28-161 Warrior II 1982
Not yet verified
Offered for aircraft of this type. It passes the plausibility gate, and the engine reads its limits from it (139 checks in test:poh-engine, shared across the shelf). No suite yet reproduces its printed performance tables.
Not tabulated in our copy: takeoff, landing, climb, cruise, stall. Those calculators stay off for this type.
Piper PA-28-140 Cherokee 140 1964
Held back
Its owner's handbook leaves the airspeed limits and the weight and balance envelope to a separate flight manual we do not hold, so it cannot pass the publishing gate. It is not offered for any aircraft.

How the proof is made

Each handbook is digitized into structured data: its limits, its loading stations, and every performance table it prints.
One calculation engine reads that data. The scheduler, the weight and balance check and every calculator use the same engine, so what is tested is what you fly on.
Suites assert that the engine returns the values printed in the handbook, and that every gate which can stop a flight refuses when it should.
A script runs the suites and reads their own pass counts to produce the numbers on this page. It refuses to publish while any suite fails, and the test run fails whenever the published numbers are out of date.

Published tables reproduced

2,274 checks

The engine is given a printed table's inputs and must return the printed value.

Published tables reproduced: counted suites
Suite	What it proves	Checks
`test:poh`	Cessna 172H gold suite and the classic-format suite (172H, 172L)	403
`test:poh-gama`	GAMA-format handbooks (172N, 172P)	1,417
`test:poh-mooney`	Mooney M20F	454

test:poh
403
What it proves
Cessna 172H gold suite and the classic-format suite (172H, 172L)
test:poh-gama
1,417
What it proves
GAMA-format handbooks (172N, 172P)
test:poh-mooney
454
What it proves
Mooney M20F

Handbook gates

391 checks

A tail only ever computes from its own handbook, and a handbook only ships if it is plausible.

Handbook gates: counted suites
Suite	What it proves	Checks
`test:poh-engine`	Each handbook's own limits read by the engine	139
`test:poh-gate`	A tail is never shown another type's handbook	50
`test:poh-data`	A tail with no handbook refuses rather than borrowing one	29
`test:poh-verify`	Physics and plausibility gate	18
`test:poh-normalize`	Units and shapes across handbook eras	49
`test:poh-match`	Warns when a handbook is for a different airframe	36
`test:poh-support`	Calculators only where a table is transcribed	31
`test:poh-shelf`	Every attachable handbook has engine verification	18
`test:poh-shelf-switch`	A withdrawn handbook stops serving everywhere	21

test:poh-engine
139
What it proves
Each handbook's own limits read by the engine
test:poh-gate
50
What it proves
A tail is never shown another type's handbook
test:poh-data
29
What it proves
A tail with no handbook refuses rather than borrowing one
test:poh-verify
18
What it proves
Physics and plausibility gate
test:poh-normalize
49
What it proves
Units and shapes across handbook eras
test:poh-match
36
What it proves
Warns when a handbook is for a different airframe
test:poh-support
31
What it proves
Calculators only where a table is transcribed
test:poh-shelf
18
What it proves
Every attachable handbook has engine verification
test:poh-shelf-switch
21
What it proves
A withdrawn handbook stops serving everywhere

Digitizing and publishing

191 checks

A new handbook cannot publish unless the engine reproduces its source values.

Digitizing and publishing: counted suites
Suite	What it proves	Checks
`test:poh-extract`	Extraction consensus	120
`test:poh-publish`	Publish gate	71

test:poh-extract
120
What it proves
Extraction consensus
test:poh-publish
71
What it proves
Publish gate

Flight gates

518 checks

The checks that can stop a booking or change a number a pilot flies on.

Flight gates: counted suites
Suite	What it proves	Checks
`test:wb-verdict`	Weight and balance go or no-go	11
`test:wb-export`	Weight and balance exports	42
`test:currency`	Pilot currency	29
`test:airworthiness`	Airworthiness gate	15
`test:route`	Route math	15
`test:dispatch-gate`	Dispatch verdict at checkout	90
`test:wb-loading`	Takeoff and landing loading, station placards	256
`test:runway-wind`	Crosswind and density altitude	60

test:wb-verdict
11
What it proves
Weight and balance go or no-go
test:wb-export
42
What it proves
Weight and balance exports
test:currency
29
What it proves
Pilot currency
test:airworthiness
15
What it proves
Airworthiness gate
test:route
15
What it proves
Route math
test:dispatch-gate
90
What it proves
Dispatch verdict at checkout
test:wb-loading
256
What it proves
Takeoff and landing loading, station placards
test:runway-wind
60
What it proves
Crosswind and density altitude

Total: 3,374 checks in 23 suites, 0 failing. Scheduling, billing, permissions and interface tests run on every change too. They are not in this number, because it counts only what can change a figure a pilot flies on or stop a flight.

Reference only. Not an FAA-approved flight manual.

Verified means the engine reproduces the published tables of that type's handbook. It does not mean those numbers fit your airplane. Your empty weight, equipment and modifications come from your own records, and the approved flight manual for your serial number, its placards and your current weight and balance are the authority.

Found a number that disagrees with your handbook? Tell us, with the page and the value, and we will check it against the source.

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