Talk:Fokker F28 Fellowship

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Aviation: Aircraft

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Hydraulic system

Latest comment: 5 months ago1 comment1 person in discussion

The aircraft had several hydraulic systems, not the least of which was the large airbrake at the base of the tail. I am unable to find the cited source 8, due to no title or any other information besides a date and page number. There are several sources that mention hydraulic systems on the aircraft, as well as the presence of switches and gauges in the cockpit for said systems.

Sources:

https://services.casa.gov.au/airworth/airwd/ADfiles/OVER/F28/F28-054.pdf Official government source mentions hydraulic systems in context of stabilizer trim (commonly used on aircraft)

https://downloads.justflight.com/products/JFF003039/F28_Professional_MSFS_Manual_v2.2.pdf Manual for a highly detailed simulation of the aircraft details the hydraulic systems, modeled after study of the physical aircraft and its manuals

"Two completely independent hydraulic systems are supplied via two engine-driven pumps, one on each engine. The pumps supply 3,000 PSI to both the UTILITY system (System No. 1) and the FLIGHT CONTROL system (System No. 2). An electrically driven pump powered by the AC busbars also supplies pressure to the UTILITY system...

All flying controls are duplicated across both pilot stations and are mechanically-hydraulically connected to the respective control surfaces. In the case of a control lock or a runaway flight control condition caused by a stuck servo valve, the hydraulic system can be manually depressurized via controls in the cockpit...

A hydraulically operated speedbrake is located on the rear of the fuselage, controlled via a single hydraulically controlled actuator, which in turn is mechanically linked to the control lever on the centre pedestal..

Lift dumpers on the top side of both wings spoil lift and increase drag after touchdown. These are hydraulically controlled via the UTILITY system and can only be operated when the aircraft is on the ground."

https://www.easa.europa.eu/sites/default/files/dfu/TCDS_EASA.A.037_Fokker_F28_Iss_08.pdf Type Certificate from EASA, pp. 16 "Hydraulic Fluid Specification Skydrol 500 B, 500 B‐4, LD‐4, HyJet IV."

https://downloads.regulations.gov/FAA-2018-0707-0004/attachment_1.pdf Details a directive regarding the hydraulic landing gear actuation system ~2026-81605-5 (talk) 22:24, 5 February 2026 (UTC)Reply

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