ATR ATR 42-300

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
4016341906	ALTIMETER	AEROSP	ATR 42-300 ATR 42-500+3	34	Instruments	OEM
490250	SEAL	—	ATR 42-300 ATR 42	36	Consumables / Hardware	PMA
56774068013	GAUGE	—	ATR 42-300 ATR 42	79	unknown	OEM
8210176C	STUD	—	Dash 8-400 ATR 42-300+2	73	unknown
AD3121	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
AD3122	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
D228780001	PROXIMITY SWITCH	AEROSP	ATR 42-300 ATR 42	32	Instruments	OEM
D56797	AXLE	MESSIER	ATR 42-300 ATR 42+1	32	Landing Gear	OEM
E95300013023	SEAT TRACK	—	ATR 42-300 ATR 42+1	53	Interior / Furnishings	PMA
F95300013023	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
NSA8206145	SEAL	—	ATR 42-300 ATR 42	75	Consumables / Hardware	PMA
PW120	ENGINE	PWC	Dash 8-100 Dash 8-400+5	72	Engine Accessories	OEM
R251M2CW	STROBE	—	ATR 42-300 ATR 42	33	unknown
S2397140226051	FRAME	—	ATR 42-300 ATR 42	53	Structures	PMA
S2821005200900	FUEL LINE	—	ATR 42-300 ATR 42	73	Fuel Systems	OEM
S52176300204	SKIN	AEROSP	ATR 42-300 ATR 42+1	52	Structures	OEM
S5237610520801	FRAME	—	ATR 42-300 ATR 42	52	Structures	PMA
S53172201202	SKIN PANEL	AEROSP	767-300 ATR 42-300+1	53	Structures	OEM
S53172204200	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S53172208200	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S5357020100	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S53571400239	STRINGER	—	ATR 42-300 ATR 42	53	Structures	OEM
S5357160020402	STRINGER	—	ATR 42-300 ATR 42	53	Structures	PMA
S53572311200	FRAME	AEROSP	ATR 42-300 ATR 42+1	53	Structures	OEM
S5367121229801	PLATE	—	767-300 ATR 42-300+1	53	unknown
S53671290422	SUPPORT	—	767-300 ATR 42-300+1	53	unknown
S53671311206	PLATE	—	767-300 ATR 42-300+1	53	unknown
S5367131121051	STRINGER CLIP	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367131830402	PLATE	—	767-300 ATR 42-300+2	53	unknown
S53672107200	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S53672405210	FLOOR PANEL	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S53672407201	FLOORBEAM	—	767-300 ATR 42-300+1	53	unknown
S5367240722801	STRINGER CLIP	—	767-300 ATR 42-300+1	53	unknown	OEM
S53672410234	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S53672410284	FLOORBEAM	AEROSP	767-300 ATR 42-300+2	53	Structures	OEM
S53673000203	SUPPORT FITTING	AEROSP	767-300 ATR 42-300+1	53	Structures
S53678008216702	ZEE	—	767-300 ATR 42-300+1	53	unknown
S5367800826902	FLOOR SUPPORT	AEROSP	767-300 ATR 42-300+2	53	Structures	OEM
S5367800828202	FLOOR SUPPORT	—	767-300 ATR 42-300+1	53	Structures	PMA
S537129034801	BRACKET	—	767-300 ATR 42-300+1	53	unknown
S5411020000400	W-MOUNT	—	ATR 42-300 ATR 42	71	Structures	PMA
S5751008002100	FITTING	—	ATR 42-300 ATR 42	57	unknown
S575101300200	GUIDE	—	ATR 42-300 ATR 42	57	unknown
S575101300300	GUIDE	—	ATR 42-300 ATR 42	57	unknown
S5751013500500	GUIDE	—	ATR 42-300 ATR 42	57	unknown
S575101500200	GUIDE	—	ATR 42-300 ATR 42	57	unknown
S5751067000400	FITTING	AEROSP	ATR 42-300 ATR 42	57	unknown	PMA
S57511013500300	GUIDE	—	ATR 42-300 ATR 42	57	unknown
S57511013500500	GUIDE	—	ATR 42-300 ATR 42	57	unknown
ST314408	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.