De Havilland Canada Dash 8-400

11,437 parts applicable to this airframe — turboprop

Part Number	Description	Manufacturer	Airframe	ATA	Category	Status
100005511	LIGHT	—	Dash 8-400 Dash 8	33	Electromechanical	PMA
10167NO1W00 (Boeing of Canada Ltd. P/N 8SC055)	Torque Indicator	AMETEK Aerospace	Dash 8-400	31	Instruments	PMA
10174N04W02 (Boeing of Canada Ltd. P/N 8SC0360)	Torque Indicator	AMETEK Aerospace	Dash 8-400	31	Instruments	PMA
106788A2102	VALVE	—	Dash 8-400 Dash 8	28	unknown
16032311	PIPE	dhav	Dash 8-400 Dash 8	21	Consumables / Hardware	OEM
307BPE	LIGHT	—	757-200 Dash 8-400+1	33	Electromechanical	PMA
310890801	IMPELLER	—	Dash 8-400 Dash 8	72	unknown
5906185, Dwg. No. 5906185 Rev. D, dtd. 3/21/86	Shaft, Flexible	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734177B	Outline-Flap Power Drive Unit, Standard Option	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734181C	Actuator #4 Outline	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734181D Dwg. 734181 Rev. G, dtd 3/12/86	Actuator #4	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734183A	Outline Transfer Gearbox	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734185B	Outline Torque Sensor	Hamilton Sundstrand	Dash 8-400	27	Instruments	PMA
734187B Dwg. 734187 Rev. G, dtd 2/19/85	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734189	Flexible Shaft Outline	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734374c	Actuators 1,#2,and #3	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734374D Dwg. 734374 Rev. G, dtd 3/12/86	Actuators 1, #2, #3	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734376	Flexible Shaft Outline	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734378C	Outline -Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734380B	TORQUE TUBE	SUNDSTRANDAI	Dash 8-400 Dash 8	57	Flight Controls	OEM
734382C	Outline - Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734382D Dwg. 734382 Rev. H, dtd 8/20/E	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734384B	Torque Tube Outline	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734384B Dwg. 734384 Rev. E, dtd 11/21/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734386B Dwg 734386 Rev. E, dtd 11/21/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734388B	Torque Tube Outline	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
734388B Dwg. 734388 Rev. E, dtd 11/21/84	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735383C	Outline Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735619A	Coupling Outline Shaft, Flex	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
735619B Dwg. 735619 Rev. E, dtd 5/1/86	Torque Tube	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
743407, Dwg. No. 743407 Rev. A, dtd. 3/20/86	Drive Brake	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
743407A Dwg. 743407 Rev. C, dtd 5/11/90	Draq Brake	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
744975 Dwg. No. 744975 Rev. A, dtd. 1/9/86	Transfer Gearbox	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
744975A Dwg. 744975 Rev. D, dtd 3/19/87	Transfer Gearbox	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745554, Dwg. No. 745554 Rev. N/C, dtd. 1/28/86	Torque Sensor	Hamilton Sundstrand	Dash 8-400	27	Instruments	PMA
745581, Dwg. No. 745581 Rev. N/C, dtd. 11/7/85	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745583, Dwg. No. 745583 Rev. A, dtd. 1/9/86	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745583A Dwg. 745583 Rev. H, dtd 5/4/87	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745586 Dwg. 745586, Rev. B, dtd. 5/29/86	Coupling, Shaft Flexible	Hamilton Sundstrand	Dash 8-400	27	Flight Controls	PMA
745593 Dwg. 745593, Rev. B, dtd. 4/14/86	Flexible Shaft	Hamilton Sundstrand	Dash 8-400	37	Engine Accessories	PMA
82440006002	WIRE	—	Dash 8-400 Dash 8	28	Electromechanical	PMA
82760114001	PUSHROD	BOMBDR	Dash 8-400 Dash 8	27	Flight Controls	OEM
82950010337	LINE	—	Dash 8-400 Dash 8	29	unknown
84104M	PSEU	ELDEC	Dash 8-400 Dash 8	32	Electromechanical	OEM
85520271003	BUMPER BLOCK	—	Dash 8-400 Dash 8	27	unknown
85710323113	ANGLE	—	Dash 8-400 Dash 8	54	Structures	PMA
85780025103	BRACKET	—	Dash 8-400 Dash 8	57	unknown
CSP42436	SCREW	—	Dash 8-400 Dash 8	56	Consumables / Hardware	PMA
NHSSMKP21BSD702	BEARING	—	Dash 8-400 Dash 8	27	unknown
SAME	GENERATOR	—	Dash 8-400 Dash 8	24	Electromechanical	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.