Torque Converter for Aviation Mechanics

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Enter Torque Value

Value

From Unit

Inch-Pounds

—

in·lb

Foot-Pounds

—

ft·lb

Newton-Meters

—

N·m

Kilogram-centimeters

—

kg·cm

Kilogram-meters

—

kg·m

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Quick Conversion Reference

in·lb	ft·lb	N·m	kg·cm
12	1.00	1.356	13.83
24	2.00	2.712	27.66
36	3.00	4.068	41.49
48	4.00	5.424	55.32
60	5.00	6.779	69.15
72	6.00	8.135	82.97
84	7.00	9.491	96.80
96	8.00	10.847	110.63
120	10.00	13.558	138.29
180	15.00	20.338	207.43
240	20.00	27.117	276.58
300	25.00	33.896	345.72
360	30.00	40.675	414.87
480	40.00	54.234	553.15
600	50.00	67.792	691.44
720	60.00	81.351	829.73
960	80.00	108.47	1106.31
1200	100.00	135.58	1382.89

Challenger 350 / 650 MX Torque Reference Worksheets

Approved-Data Workflow

These worksheets are built only as a quick lookup and note-taking aid for repeat jobs on Challenger 350 and Challenger 650 fleets. They do not reproduce, replace, or stand in for approved maintenance data. Fill the torque column only from the current approved AMM, CMM, SRM, or operator task card that applies to the exact aircraft, effectivity, and revision at the time of the job.

Record the exact task reference and revision you used
Note whether the torque is dry, lubricated, prevailing-torque plus run-on, or angle-tightened
Use the converter above when the source unit does not match your wrench
Do not carry values forward without checking revision status and effectivity

Challenger 350 Common Torque Lookup Jobs

Job	ATA / Area	Typical Hardware	Approved Ref	Torque	Notes
Main wheel install / close-up after tire or brake work	ATA 32	Wheel half / axle / retention hardware	AMM task / CMM	________	Confirm tire servicing and any post-install leak or drag checks.
Nose wheel install / servicing close-up	ATA 32	Wheel hardware, cap, valve components	AMM task / CMM	________	Note shimmy or towing observations if applicable.
Brake assembly removal / installation close-out	ATA 32	Brake mounting fasteners, hydraulic fittings	AMM task / CMM	________	Record fitting seal replacement and leak check requirement.
Engine cowl or access door close-up	ATA 71	Quarter-turns, latch hardware, hinge fasteners	AMM task	________	Different fastener families may have different limits in the same zone.
Thrust reverser / nacelle access panel close-up	ATA 78	Panel screws, retainers, latch hardware	AMM task	________	Track effectivity carefully by engine / nacelle configuration.
Battery compartment / external service panel close-up	ATA 24 / 12	Panel fasteners, hold-down hardware	AMM task	________	Verify bonding, venting, and lockwire or cotter requirements if specified.
Seat track or interior floor panel reinstall	ATA 25	Track bolts, floor panel screws, nutplates	AMM / IPC / task card	________	Confirm interior configuration effectivity and locking features.
Landing gear door or fairing close-up after inspection	ATA 32 / 52	Panel screws, hinge fasteners, latch hardware	AMM task	________	Different doors and fairings may call out different torque families.

Challenger 650 Common Torque Lookup Jobs

Job	ATA / Area	Typical Hardware	Approved Ref	Torque	Notes
Main wheel install / close-up after tire change	ATA 32	Wheel / brake / axle retention hardware	AMM task / CMM	________	Record any requirement for recheck after taxi or pressure stabilization.
Brake wear inspection close-out	ATA 32	Brake tie bolts, fittings, retaining hardware	AMM task / CMM	________	Note seal replacement, bleed requirement, and leak inspection.
Nose gear wheel servicing / reinstall	ATA 32	Wheel hardware, caps, steering-related close-up hardware	AMM task	________	Check towing and steering task references where applicable.
Engine cowling or fan cowl close-up	ATA 71	Latch hardware, panel screws, hinge points	AMM task	________	Use exact engine / nacelle effectivity, especially on close-out tasks.
Thrust reverser access / close-out	ATA 78	Access panel fasteners, latches, lock devices	AMM task	________	Include secondary locking or witness-mark requirement if called out.
APU or tailcone access close-up	ATA 49 / 53	Panel hardware, nutplates, retainers	AMM task	________	Useful for repeat inspection access jobs and line troubleshooting close-ups.
Flight deck or avionics bay equipment tray reinstall	ATA 23 / 34	Tray fasteners, rack retainers, bonding hardware	AMM / component task	________	Confirm connector handling, bonding jumpers, and rack hardware type.
Interior monument / floor panel close-up after troubleshooting	ATA 25	Panel screws, seat track fasteners, floor hardware	AMM / operator task card	________	Keep cabin completion differences in mind on mixed fleets.

Important Torque Notes

This page is a general quick-reference aid only and is not FAA-approved, manufacturer-approved, or a substitute for the current AMM, CMM, SRM, IPC, or operator task card.
Always verify torque values against the current approved AMM, CMM, SRM, or task card for the specific task, aircraft serial effectivity, and hardware configuration.
Torque specs listed in maintenance documents may include wet or dry torque — verify which applies.
Use a calibrated torque wrench within its rated range (typically 20%–80% of max capacity for best accuracy).
1 ft·lb = 12 in·lb exactly. This is the most common conversion in aircraft maintenance.
N·m is the SI unit for torque. Most modern Airbus documentation uses N·m; Boeing often uses in·lb or ft·lb.
Fleet worksheets for Challenger 350 and 650 jobs should reference the exact task number and revision used for that aircraft effectivity.
When using a torque wrench extension, you must calculate the corrected torque value — the reading on the wrench will differ from the actual applied torque.