ATR ATR 42

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
0L3042BPE	LIGHT	—	ATR 42 ATR 72	33	Electromechanical	PMA
1011309111	LIGHT	—	ATR 42 ATR 72	33	Electromechanical	PMA
1155561	LAMP HOLDER	—	ATR 42-300 ATR 42+1	33	Electromechanical	PMA
134042210220	FITTING	—	ATR 42	25	unknown
134042210221	FITTING	—	ATR 42	25	unknown
15S53572604205	STRAP	—	ATR 42-300 ATR 42	53	Structures	PMA
25357160001060	KEEL BEAM	—	ATR 42-300 ATR 42	53	Structures	PMA
30111511	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
3011152	BATTERY PACK	—	DHC-6 Twin Otter ATR 42-300+1	73	Environmental / Cabin	PMA
3011154	BATTERY	—	ATR 42-300 ATR 42	33	Electromechanical	PMA
30111803011151	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
3071	LIGHT	Boeing	737-400 737-900+8	33	Interior / Furnishings	OEM
7007552	RESISTOR	—	ATR 42-300 ATR 42+1	33	Electromechanical	PMA
9507209	TORQUE TUBE	—	ATR 42-300 ATR 42	71	Consumables / Hardware	PMA
E0242A28C1	RELAY	Airbus	A321 A321-200+2	34	Electromechanical	OEM
S2711001500300	IDLER ARM	—	ATR 42-300 ATR 42	27	Flight Controls	PMA
S3678001202	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S52176404200	SIDE PANEL	—	ATR 42-300 ATR 42	52	Interior / Furnishings	PMA
S52176405200	PANEL	—	ATR 42	52	unknown
S52176405204	SKIN	—	ATR 42	52	Structures	PMA
S5217666600200	SHOOT BOLT	—	ATR 42	52	Consumables / Hardware	PMA
S5227750120001	ATTACH FITTING	AEROSP	ATR 42	52	Structures	OEM
S52376104202	DOOR FRAME	AEROSP	ATR 42 ATR 72	52	Structures	OEM
S5247765700200	SHOOT BOLT	—	ATR 42 ATR 72	52	Consumables / Hardware	PMA
S525784000051	FITTING	—	ATR 42	32	unknown
S5337122301000	FITTING	—	ATR 42	52	unknown
S53371265206	FRAME	—	ATR 42-300 ATR 42	53	Structures	PMA
S5337129320001	DRAIN TRACK	—	ATR 42-300 ATR 42+1	53	Interior / Furnishings	PMA
S53371293202	ATTACH FITTING	AEROSP	ATR 42-300 ATR 42+1	52	Structures	OEM
S53375001200	SEAT TRACKS	AEROSP	ATR 42-300 ATR 42	53	Interior / Furnishings	OEM
S533R001620400	CREASE BEAM	—	ATR 42-300 ATR 42	53	Structures	PMA
S5357840000100	FITTING	—	ATR 42	32	unknown
S53578400201	FITTING	—	ATR 42-300 ATR 42	32	unknown
S53671217211	CLOSEOUT PANEL	AEROSP	767-300 ATR 42-300+2	53	Structures	OEM
S5367131831001	THRESHOLD	—	767-300 ATR 42-300+2	53	Structures	PMA
S5367140021202	STRINGER	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367140023202	STRINGER	—	767-300 ATR 42-300+1	53	Structures	PMA
S53671406202	STIFFENER	—	767-300 ATR 42-300+1	53	Structures	PMA
S53672020222	STRINGER	—	767-300 ATR 42	53	Structures	PMA
S53672215202	FLOOR BEAM	AEROSP	767-300 ATR 42-300+1	53	Structures	OEM
S5367240423451	FLOOR BEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S536724060801	FLOORBEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367240800463	FLOOR BEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S536780012222	SEAT TRACK	—	767-300 ATR 42	53	Interior / Furnishings	PMA
S536780012391	SEAT TRACK	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S53678001242	SEAT TRACK	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S5367800210	SEAT TRACK	—	767-300 ATR 42-300+2	53	Interior / Furnishings	PMA
S53872701200	SKIN	AEROSP	ATR 42-500 ATR 42	53	Structures	OEM
S575167000000	HINGE FITTING	—	ATR 42	57	Structures	PMA
ST231426	EGT RESISTOR	—	ATR 42-300 ATR 42	77	Electromechanical	PMA

Utilization & cargo trend(US carriers, 2015–2025)

ATR family rollup — BTS T-100, domestic + international

Cycles per aircraft

2422025

20152025

2020: 278

Recovered to 176% of 2019 (2024 vs 2019)

Freighter share of departures

24%→44%2015 → 2025

20152025

Est. US-registered fleet

642025

20152025

US carriers only (BTS T-100, domestic + international segments) — foreign-carrier flying is excluded, so global utilization runs higher. Fleet size is reconstructed from the FAA registry (built on or before each year, not yet deregistered) — an approximation. Freighter share counts departures with zero passengers and freight aboard — a proxy for freighter/combi operations, not a tail-by-tail conversion count. Missing years render as gaps.

USM supply — retirements & teardowns(2023–2026)

ATR family — FAA registry deregistrations

Left the US registry

34aircraft

Stayed domestic

10vs 24 exported

Avg age at retirement

18.7years

Still US-registered

64aircraft

Where this family's parts catalog concentrates — the systems most exposed to incoming teardown supply

43.3%(1,673)

10.8%(417)

7.1%(276)

5.8%(224)

ATA 32 — Landing Gear

5.7%(220)

FAA registry data. Domestic deregistration is a teardown proxy — it also captures re-registrations and some unflagged exports, so it is not a confirmed part-out count; exported aircraft left the US fleet intact and are not USM supply. ATA shares reflect where this directory's parts for the family concentrate (parts in parentheses) — a coverage signal, not the aircraft's bill of materials or a teardown-yield forecast.

Engine-program supply pressure(since 2023)

FAA registry — US-registered fleet

Engines account for roughly half of all MRO spend, so engine programs shedding aircraft are where retirement supply carries the most value.

Engine model	Active tails	Engine units	Retired since ’23	Exported	Avg age at dereg
P&W CANADA PW120	17	34	4	3	31.8 yr
P&W CANADA PW121	14	28	4	6	33 yr
P&W CANADA PW127M	19	38	1	6	12.9 yr
P&W CANADA PW127E	1	2	1	1	19 yr
P & W 127	3	6	0	0	—
P&W CANADA PW124	2	4	0	0	—
P&W CANADA PW127F	2	4	0	2	18.5 yr

FAA registry data, US-registered aircraft only. Counts reflect the engine model as registered — generic “series” rows coexist with thrust-variant rows, so per-variant figures are partial. Retired = domestic deregistrations (a teardown proxy, not a confirmed part-out); exported aircraft left the US fleet intact. Active tails span every family the engine flies on, not just this one.

Maintenance economics(US carriers, through 2025)

ATR family — BTS Form 41 filings

Direct maintenance per block hour

$178fleet avg

Airframe / engine split

$171/$7

Reporting carriers

BTS Form 41 data (Schedule P-5.2 maintenance expense over T-2 block hours), Group III US carriers only — filers above $1B annual revenue; smaller US operators, Part 135, and all non-US carriers are not in this data. Dollars are accrual-basis from regulatory filings (reserves and depreciation included), so they benchmark fleet economics and do not track to individual repair events. Averages are block-hour- weighted across every reporting carrier; the range spans per-carrier rates after excluding marginal reporting slices, and small carrier counts are noisy.

Airworthiness Directive activity

FAA / EASA public regulatory data

52airworthiness directives affecting this fleet — recurring compliance demand for the parts and shops that serve it

Most recent

EASA AD 2025-0103effective May 19, 2025Mixed actions
EASA Safety Publications Tool
EASA AD 2025-0087effective Apr 30, 2025Mixed actions
EASA Safety Publications Tool
EASA AD 2025-0080effective Apr 25, 2025Mixed actions
EASA Safety Publications Tool
EASA AD 2025-0045effective Mar 5, 2025Mixed actions
EASA Safety Publications Tool
EASA AD 2025-0044effective Mar 5, 2025Mixed actions
EASA Safety Publications Tool

Directives linked to this airframe family in the FAA / EASA regulatory corpus we have processed — not a complete historical AD list. An AD is a compliance requirement that drives scheduled work (inspections, replacements, modifications) across the fleet; inspection directives are not replacement directives, and none of this is a prediction that any part will fail.