ATR ATR 42

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
121CC01A	CONTACT	—	ATR 42-300 ATR 42	24	unknown
13S52277001000A0	SADDLE	—	ATR 42-300 ATR 42	52	unknown
20032	GENERATOR	—	ATR 42	24	Electromechanical	PMA
311192801	SENSOR	—	ATR 42	77	unknown
4241601	LIGHT	—	ATR 42-300 ATR 42	33	Electromechanical	PMA
683GC01Y01	BPU	—	ATR 42-300 ATR 42	24	unknown
7003365944	AHRS COMPUTER	—	ATR 42-300 ATR 42	34	unknown
7012211	BULB	—	ATR 42-300 ATR 42	33	unknown
83161030010	TRANSMITTER	—	ATR 42-300 ATR 42+1	79	unknown
AA3127	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
AD3107	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
EO33601	SOCKET	—	ATR 42-300 ATR 42+1	33	unknown
NSA931320100	CIRCUIT BREAKER	—	ATR 42-500 ATR 42	33	Electromechanical	PMA
OL3042BPE	BULB	—	ATR 42-300 ATR 42+1	33	unknown
S5217620420602	PAN	—	ATR 42-300 ATR 42+1	52	unknown
S52376108202	BRACKET	—	ATR 42	52	unknown
S523765192202	HINGE	—	ATR 42	52	Structures	PMA
S5317310300100	FLOORBEAM	—	767-300 ATR 42	53	unknown
S53173206200	ATTACH PLATE	AEROSP	767-300 ATR 42-300+2	53	Structures	OEM
S53173206201	FLOORBEAM	AEROSP	767-300 ATR 42+1	53	Structures	OEM
S53240820802	FLOORBEAM	—	ATR 42	53	unknown
S53337129320001	CHANNEL	—	ATR 42	53	unknown
S5337122622001	THRESHOLD	—	ATR 42-300 ATR 42	53	unknown
S5337140021402	STRINGER	—	ATR 42	53	Structures	PMA
S53372411210	FLOORBEAM	AEROSP	ATR 42-300 ATR 42	53	Structures	OEM
S53375001203	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S53375001212	SEAT TRACKS	AEROSP	ATR 42-300 ATR 42+1	53	Interior / Furnishings	OEM
S53375001214	SEAT TRACK	AEROSP	ATR 42-300 ATR 42+1	53	Interior / Furnishings	OEM
S535678001201	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S53575001202	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S5367129034801	TEE FITTING	—	767-300 ATR 42-300+2	53	Structures	PMA
S5367134820001	FRAME	—	767-300 ATR 42	53	Structures	PMA
S536713902801	SEAL RETAINER	—	767-300 ATR 42	52	Consumables / Hardware	PMA
S53671406200	DOUBLER	AEROSP	767-300 ATR 42-300+1	53	Structures	OEM
S53676208202	FLOORBEAM	—	767-300 ATR 42-300+1	53	unknown
S53678001200201	SEAT TRACK	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S53678001201222	SEAT TRACK	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S5367800824602	ZEE MEMBER	—	767-300 ATR 42-300+1	53	unknown
S53678008268	INTERCOSTAL	AEROSP	767-300 ATR 42	53	Structures	OEM
S53681004204	SUPPORT	—	767-300 ATR 42	53	unknown
S536R00521R0100	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S53872700222	FLOORBEAM	AEROSP	ATR 42-300 ATR 42+1	53	Structures	OEM
S53872700223	FLOORBEAM	AEROSP	ATR 42-300 ATR 42+1	53	Structures	OEM
S53874001202	CLIP	—	ATR 42-300 ATR 42	53	Consumables / Hardware
S5387500001800	DOOR	—	ATR 42-300 ATR 42	52	Structures	PMA
S5397130920401	SUPPORT	—	ATR 42	53	unknown
S53971402218	SPLICE	—	ATR 42	53	unknown
S5711124120001	BRACKET	—	ATR 42-300 ATR 42	57	unknown
S5721158100000	RIB	—	ATR 42	57	unknown
S5751065500141	FITTING	—	ATR 42	27	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.