ATR ATR 42

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
011260500	COOLING FAN	—	ATR 42-500 ATR 42+1	21	Environmental / Cabin	PMA
1818	BULB	—	MD-11 ATR 42-300+1	33	Consumables / Hardware	PMA
301180	POWER SUPPLY	—	ATR 42	33	Electromechanical	PMA
5010783	DISC	—	ATR 42-300 ATR 42	32	Engine Accessories	PMA
8210181A	PUMP	—	ATR 42	61	Hydraulics	PMA
A03127	BATTERY PACK	—	ATR 42-300 ATR 42	33	Environmental / Cabin	PMA
ASA972844AA	RELAY	—	ATR 42-300 ATR 42	24	Electromechanical	PMA
C245850001	UPLOCK	—	ATR 42-300 ATR 42	32	Landing Gear	PMA
D228980003	ACTUATOR	—	ATR 42-300 ATR 42	32	Flight Controls	PMA
E0062BS4BA0A	SWITCH	—	ATR 42-300 ATR 42	21	Electromechanical	PMA
NSA93323503	BULB	—	ATR 42-300 ATR 42	33	Consumables / Hardware	PMA
S27281929002	CONTROL ROD	—	ATR 42-300 ATR 42	27	Flight Controls	PMA
S52176301200	SKIN	AEROSP	ATR 42-300 ATR 42+1	52	Structures
S5337124320001	CHANNEL	—	ATR 42-300 ATR 42	52	Structures	PMA
S5337124320201	PLATE	—	ATR 42-300 ATR 42	52	unknown
S53375001202	SEAT TRACKS	AEROSP	ATR 42-300 ATR 42+1	53	Interior / Furnishings
S53375001218	SEAT TRACK	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S5341009320200	BRACKET	—	ATR 42-300 ATR 42	53	unknown
S53570201200	SEAT TRACKS	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S5357250120451	FRAME	—	ATR 42-300 ATR 42	53	Structures	PMA
S53671217210	CLOSEOUT PANEL	AEROSP	767-300 ATR 42-300+2	53	Interior / Furnishings
S5367121721001	PLATE	—	767-300 ATR 42-300+2	53	unknown
S5367121721101	PLATE	AEROSP	767-300 ATR 42-300+2	53	Structures	unknown
S53671217298	DRAIN TRACK	—	767-300 ATR 42-300+1	53	Interior / Furnishings	PMA
S5367121729801	DRAIN TRACK	AEROSP	767-300 ATR 42-300+2	53	Structures
S53671257201	INTERCOSTAL	—	767-300 ATR 42	53	Structures	OEM
S53671257221	STRINGER	AEROSP	767-300 ATR 42+1	53	Structures
S5367131024251	FRAME	—	767-300 ATR 42-300+1	53	Structures	PMA
S53671318B1001	SILL	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367140721600	STRINGER	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367240710201	FLOORBEAMS	—	767-300 ATR 42-300+1	53	Structures	PMA
S536724072F2	FLOOR BEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S53672409208	STRINGER	—	767-300 ATR 42	53	Structures	PMA
S5367290601261	FLOORBEAM	—	767-300 ATR 42-300+1	53	Structures	PMA
S53678001213	SEAT TRACK	—	767-300 ATR 42	53	Interior / Furnishings	PMA
S53678008214	CREASE BEAM	—	767-300 ATR 42	53	Structures	PMA
S5367800821451	INTERCOSTAL	—	767-300 ATR 42-300+1	53	Structures	PMA
S5367800826901	FLOOR SUPPORT	—	767-300 ATR 42-300+2	53	Structures	PMA
S53678008282	SUPPORT	—	767-300 ATR 42	53	unknown
S5391004320200	BRACKETS	—	ATR 42-300 ATR 42	53	Interior / Furnishings	PMA
S5391009320200	FIREWALL BRACKET	—	ATR 42-300 ATR 42	54	Interior / Furnishings	PMA
S5397000420000	BRACKET	—	ATR 42-300 ATR 42	53	unknown
S5397000425800	BRACKET	—	ATR 42-300 ATR 42	53	unknown
S54210203100000	TUBE	—	ATR 42-300 ATR 42	71	unknown
S5421020929301	TUBE	—	ATR 42-300 ATR 42	71	unknown
S542102100000F	ROD	—	ATR 42-300 ATR 42	54	unknown
S5421021000051	TUBE	—	ATR 42-300 ATR 42	71	unknown
S54210210000F	TUBES	—	ATR 42-300 ATR 42	53	Consumables / Hardware	PMA
S57110897200	SKIN	AEROSP	ATR 42-300 ATR 42	57	Structures
S9251155500000	LIGHT	—	ATR 42-300 ATR 42	33	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.