ATR ATR 42-300

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
1156100	PRESSURE SWITCH	INTERTECHNIQ	ATR 42-300 ATR 42+1	79	Instruments	OEM
22044005	COOLING TURBINE	ALIDSG	ERJ-145 ATR 42-300+1	21	Environmental / Cabin	OEM
30111180	BATTERY PACK	—	ATR 42-300 ATR 42	33	Electromechanical	OEM
3011162	COVER	—	ATR 42-300 ATR 42+1	33	unknown
3033986	TUBE	—	ATR 42-300 ATR 42	71	unknown
310657101	GASKET	—	ATR 42-300 ATR 42	72	Consumables / Hardware	OEM
56777508012	INDICATOR	—	ATR 42-300 ATR 42	77	Instruments	PMA
690200	DUCT SEAL	—	ATR 42-300 ATR 42	36	unknown	OEM
7003652902	AUTOPILOT SYS	—	ATR 42-300 ATR 42	34	Avionics / Electronics	OEM
7004544412	COMPUTER	—	ATR 42-300 ATR 42	31	unknown	OEM
AD312	BATTERY PACK	—	ATR 42-300 ATR 42	33	Electromechanical	PMA
ASNA2141	SEAL	—	ATR 42-300 ATR 42	36	Consumables / Hardware	PMA
ASNA21414007	O-RING	—	ATR 42-300 ATR 42+1	36	Consumables / Hardware	PMA
CT7G010	SMOKE DETECTOR	—	ATR 42-300 ATR 42	26	Safety / Emergency	PMA
D227010001	WIRE HARNESS	—	ATR 42-300 ATR 42	24	Avionics / Electronics	PMA
E0217XXX030A	RELAY	—	ATR 42-300 ATR 42	36	Electromechanical	PMA
E0242A115B0	RELAY	—	ATR 42-300 ATR 42	24	Electromechanical	PMA
E02442840	CONNECTOR	—	ATR 42-300 ATR 42	32	unknown
E0276CN3FP084	SWITCH	—	ATR 42-300 ATR 42	34	Electromechanical	PMA
EO24428A0	RELAY	—	ATR 42-300 ATR 42+1	32	Electromechanical	OEM
QA1218	BULB	—	ATR 42-300 ATR 42	33	unknown	OEM
S52176204204	PAN	AEROSP	767-300 ATR 42-300+1	52	unknown	PMA
S521763012000	SKIN	—	ATR 42-300 ATR 42	52	Structures	OEM
S5241053600200	ACCESS PANEL	—	ATR 42-300 ATR 42	57	Structures	PMA
S5317320600301	FITTING	—	767-300 ATR 42-300+2	53	unknown
S5317400020001	BULKHEAD	—	767-300 ATR 42-300+1	53	Structures	PMA
S53371206220	ANGLE	—	ATR 42-300 ATR 42	53	Structures	OEM
S533712932001	THRESHOLD	—	ATR 42-300 ATR 42	53	unknown	OEM
S5337140020602	STRINGER	—	ATR 42-300 ATR 42	53	Structures	PMA
S5337241120602	FLOORBEAM	—	ATR 42-300 ATR 42	53	Structures	PMA
S535721032051	BRACKET	—	ATR 42-300 ATR 42	53	unknown
S5357410020402	KEELBEAM	AEROSP	A350-900 ATR 42-300+1	53	Structures	OEM
S5367100020100	STRINGER	—	767-300 ATR 42-300+1	53	Structures	OEM
S53671000302	STRINGER	—	767-300 ATR 42-300+1	53	Structures	OEM
S5367121724801	SILL DRAIN	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367126824002	FLOORBEAM	—	767-300 ATR 42-300+1	53	Structures	OEM
S5367128920800	STRINGER	—	767-300 ATR 42-300+2	53	Structures	PMA
S5367128921000	STRINGER	—	767-300 ATR 42-300+1	53	Structures	OEM
S53671318282	DOUBLER	—	767-300 ATR 42-300+1	52	unknown	OEM
S5367134020001	CREASE BEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367138921000	STRINGER	—	767-300 ATR 42-300+1	53	Structures	PMA
S53671400413	STRINGER	AEROSP	767-300 ATR 42-300+2	53	Structures
S5367140720005	SKIN	—	767-300 ATR 42-300+1	53	Structures	OEM
S5367240422401	CLIP	—	767-300 ATR 42-300+1	53	Consumables / Hardware	PMA
S5367340900063	FLOORBEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S536740921800	FLOORBEAM	—	767-300 ATR 42-300+1	53	Structures	OEM
S5367800826020	FLOOR SUPPORT	—	767-300 ATR 42-300+1	53	Structures	PMA
S5411001000000	MOUNT	—	ATR 42-300 ATR 42	71	unknown
S542102001000	MOUNT	—	ATR 42-300 ATR 42	71	unknown
TL571L1500	CABLE	—	ATR 42-300 ATR 42	32	unknown

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.