ATR ATR 42

1,122 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
1317	FLASHLIGHT	GE	737-500 737-200+6	33	Safety / Emergency	OEM
141FL01D3	PROXIMITY SWITCH	ECE	A300 A310+4	32	Electromechanical
167006	EEL LAMP	MICRO	ATR 42-300 ATR 42-500+2	33	Safety / Emergency	OEM
1864	INDICATOR LAMP	GE	727-100 727-200+6	33	Instruments	OEM
3011210	EEL ASSEMBLY	AEROSP	ERJ-145 ATR 42-300+2	33	Electromechanical	OEM
301210	EEL ASSY	—	ATR 42-300 ATR 42+1	33	Safety / Emergency
3033515	NH SENSOR	—	737-300 737+2	77	Instruments
3035681	FUEL FILTER	—	Dash 8-400 ATR 42-300+5	73	Fuel Systems
311479301A	HARNESS	—	ATR 42-300 ATR 42	73	unknown	OEM
313	VALVE	—	A320 DC-8+4	32	unknown	OEM
327	WARNING LIGHT	GE	King Air 200 727-200+8	32	Instruments	OEM
350A23008314	CCAS COMPUTER	—	ATR 42-300 ATR 42	31	Avionics / Electronics
5009986C	FUEL PUMP	—	Embraer EMB-120 Brasilia ATR 42	73	Fuel Systems
53171122200	WINDSHIELD FRAME	—	ATR 42-300 ATR 42	53	Structures
53171122201	WINDSHIELD FRAME	—	ATR 42-300 ATR 42	53	Structures
5905587	HP FUEL FILTER	—	Dash 8-400 ATR 42-300+3	73	Fuel Systems
60001	TEMP STRIP	—	Bell 206 ATR 42	63	Instruments
7000700959	AIR DATA COMP	Honeywell	ATR 42-300 ATR 42	34	Avionics / Electronics	OEM
7012210	EEL BULB	NEC	ATR 42-300 ATR 42-500+2	33	Interior / Furnishings
7863927	FUEL CONTROL	—	ATR 42-300 ATR 42	73	Fuel Systems
82363	ACTUATOR	AVIAC	ATR 42-300 ATR 42+1	27	Electromechanical	OEM
83001	ACTUATOR	—	ATR 42	27	Electromechanical
D228830001	PROXIMITY SENSOR	—	ATR 42-300 ATR 42-500+1	32	Instruments
E006C6S4BJ0A	SWITCH	—	ATR 42	27	Electromechanical
E033601	BALLAST	—	ATR 42-300 ATR 42+1	33	Interior / Furnishings
FR3222	SMOKE DETECTOR	—	ATR 42-300 ATR 42+1	26	Safety / Emergency
MS2125005016	BOLTS	—	ATR 42-300 C441 Conquest+2	32	Consumables / Hardware	OEM
MS27371G0143	HYD LINE	—	ATR 42-300 ATR 42	29	Hydraulics	OEM
NSA8203210	O-RING	—	ATR 42-300 ATR 42	72	Consumables / Hardware	OEM
P6048233	ARMATURE	—	ATR 42 ATR 72	24	Electromechanical
S271100880002	BELLCRANK ASSY	—	ATR 42-300 ATR 42	27	Flight Controls
S2711009100000	BELL CRANK	—	ATR 42-300 ATR 42	27	Flight Controls
S2711009100100	BELL CRANK	—	ATR 42-300 ATR 42	27	Flight Controls
S2711009100500	BELLCRANK ASSY	AEROSP	ATR 42-300 ATR 42	27	Flight Controls
S271109100000	BELLCRANK	—	ATR 42-300 ATR 42	27	Flight Controls
S2728176000200	BELLCRANK	—	ATR 42	27	Flight Controls
S2728192900200	CONTROL ROD	—	ATR 42-300 ATR 42	27	Flight Controls
S2918056213000	HYD LINE	—	ATR 42	29	Hydraulics
S52376105208	FRAME	—	ATR 42-300 ATR 42+1	53	Structures
S53171101204	WINDOW FRAME	AEROSP	767-300 ATR 42-300+1	53	Structures	OEM
S53171101205	WINDOW FRAME	—	767-300 ATR 42-300+1	53	Structures
S53171501203	STAND OFF	AEROSP	767-300 ATR 42-300+1	53	Structures	OEM
S53371229258	PLATE	—	ATR 42	53	unknown	OEM
S53572601202	SKIN STRAP	—	ATR 42	53	Structures
S5411020001000	MOUNT	—	ATR 42-300 ATR 42	71	unknown	OEM
S54210200000500	MOUNT	—	ATR 42	71	unknown	OEM
S5421020000400	Z-MOUNT	—	ATR 42-300 ATR 42	71	Structures
S54210200011000	MOUNT	—	ATR 42	71	unknown	OEM
SFM13M10A	BLADE	—	ATR 42-300 ATR 42	61	Engine Accessories
SM150D19	EEL RELAY	—	ATR 42 ATR 72	33	Electromechanical

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.