De Havilland Canada Dash 8-400

11,437 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
#3 755216 Dwg 755216 Rev. None, dated 11/30/89	Actuator	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
10174N06W03	Torque Indicator	AMETEK Aerospace	Dash 8-400	31	Instruments	PMA
2313M-227-2	Motor Converter Assembly	Rosemount Aerospace	Dash 8-400	30	Electromechanical	PMA
2315M-84-2	Blade Rigid Sidemount	Rosemount Aerospace	Dash 8-400	30	Electromechanical	PMA
2334003001	ACTUATOR	—	Dash 8-400 Dash 8	27	unknown	OEM
237400-1005	Rudder Actuator	Parker Hannifin	Dash 8-400	27	Flight Controls	PMA
237400-3001	Rudder Actuator	Parker Hannifin	Dash 8-400	27	Flight Controls	PMA
237400-3005	Rudder Actuator	Parker Hannifin	Dash 8-400	27	Flight Controls	PMA
237900-1001	Rudder Press Reg	Parker Hannifin	Dash 8-400	27	Hydraulics	PMA
237900-1005	Rudder Press Reg	Parker Hannifin	Dash 8-400	27	Hydraulics	PMA
2403001001	SOLENOID VALVE	—	Dash 8-400 Dash 8	27	unknown	OEM
241300-1001	Solenoid Valve	Parker Hannifin	Dash 8-400	—	Consumables / Hardware	PMA
2730489M1	Accumulator	Parker Hannifin	Dash 8-100 Dash 8-400+2	29	Hydraulics	PMA
2800015-101	Press Rel Dump Valve	Parker Hannifin	Dash 8-400	—	Unknown	PMA
2810070101	VALVE	Parker Hannifin	Dash 8-400 Dash 8	28	unknown	OEM
2810073-101	Main Ejector	Parker Hannifin	Dash 8-400	28	Fuel Systems	PMA
2810073-102	Main Ejector	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
2810074-101	Scavenge Eject	Parker Hannifin	Dash 8-400	79	Engine Accessories	PMA
2810108-101	Scavenge Eject Tip	Parker Hannifin	Dash 8-400	79	Engine Accessories	PMA
3810040-101	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810040-102	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810040-103	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810040-104	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810041-101	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810041-102	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810041-103	Bootstrap Resevoir	Parker Hannifin	Dash 8-400	29	Hydraulics	PMA
3810041104	RESERVOIR	—	Dash 8-400 Dash 8	29	Flight Controls	PMA
734177F Dwg 724177 Rev. AB dated 5/11/90	Flap Power Drive Unit	Hamilton Sundstrand	Dash 8-400	27	Electromechanical	PMA
734181D Dwg 724181 Rev. G, dated 3/12/86	Actuator #4	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734187B Dwg 734187 Rev. G, dated 2/19/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734330B Dwg 734380 Rev. F, dated 11/20/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734374D Dwq 734374 Rev. G, dated 3/12/86	Acuators 1, #2, #3	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734378D Dwg 734378 Rev. H, dated 8/21/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734378D Dwg. 734378 Rev. H, dtd 8/21/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734380B Dwg. 734380 Rev. F, dtd 11/20/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734382D Dwq 734382 Rev. H, dated 8/20/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734386B Dwg 734336 Rev. E, dated 11/21/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734388B Dwg 734388 Rev. E, dated 11/21/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735383D Dwg 735383 Rev. H, dated 8/21/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735383D Dwg. 735383 Rev. H, dtd 8/21/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735619B Dwg 735619 Rev. E, dated 5/1/86	Coupling, Flex Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
743407A Dwg 743407 Rev. C, dated 5/11/90	Drag Brake	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
744975A Dwq 744975 Rev. D, dated 3/19/87	Transfer Gearbox	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745533A Dwg 745583 Rev. H, dated 5/4/87	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745554A Dwg 745554 Rev. C, dated 11/4/86	Torque Sensor	Hamilton Sundstrand	Dash 8-400	27	Instruments	PMA
745554A Dwg. 745554 Rev. C, dtd 7/10/86	Torque Sensor	Hamilton Sundstrand	Dash 8-400	27	Instruments	PMA
745581A Dwg 745581 Rev. H, dated 5/4/87	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745581A Dwg. 745581 Rev. H, dtd 5/4/87	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
7786953	REGULATOR VALVE	BOMBDR	Dash 8-400 Dash 8	21	Hydraulics	OEM
MDL 651-5-004	Kit	PATS Aircraft LLC	Dash 8-400	20	unknown	PMA

Utilization & cargo trend(US carriers, 2015–2025)

Dash 8 family rollup — BTS T-100, domestic + international

Cycles per aircraft

142025

20152025

2020: 317

Recovered to 8% of 2019 (2024 vs 2019)

Freighter share of departures

0%→0%2015 → 2025

20152025

Est. US-registered fleet

982025

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)

Dash 8 family — FAA registry deregistrations

Left the US registry

81aircraft

Stayed domestic

21vs 60 exported

Avg age at retirement

22.7years

Still US-registered

96aircraft

Where this family's parts catalog concentrates — the systems most exposed to incoming teardown supply

ATA 53 — Fuselage

14.7%(798)

ATA 32 — Landing Gear

11.7%(635)

ATA 33 — Lights

8.7%(473)

ATA 29 — Hydraulic Power

6.4%(349)

ATA 52 — Doors

6.3%(341)

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 PW123	14	28	5	9	29.5 yr
P&W CANADA PW120	17	34	4	3	31.8 yr
P&W CANADA PW121	14	28	4	6	33 yr
P&W CANADA PW150A	17	34	2	34	16.2 yr
P&W CANADA PW123C	3	6	1	0	26 yr
P&W CANADA PW123D	15	30	0	0	—
P&W CANADA PW123E	5	10	0	0	—
P&W CANADA PW120A	2	4	0	1	34 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 2023)

Dash 8 family — BTS Form 41 filings

Direct maintenance per block hour

$275fleet avg

Airframe / engine split

$267/$9

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.