Section 7 – Airframe and Systems description
LANDING GEAR SYSTEM
Hydraulic oil, contained in an integrated reservoir located inside the Hydraulic
Power Pack, is pressurized by a reversible electric pump: as the LG control knob is
placed in either the UP or DOWN position, the pump directs the fluid through the
related pressure line toward each hydraulic jack.
In order to prevent an inadvertent LG retraction, the control knob must be pulled
before being pushed upward for UP command.
The emergency hydraulic accumulator is used for the landing gear extension: nor-
mal extension line and emergency extension line converge in correspondence of
the shuttle valves (two valves: the first one for NLG and the second one for MLG
emergency operation).
The emergency accumulator nitrogen pressure indicator is located on the tail cone,
left side; on ground, a red push-button located beneath the pressure indicator al-
lows the electrical pump for charging the accumulator should the nitrogen pressure
be below the lower limit indicated on the placard.
Emergency extension is controlled by two distributors located on the cabin floor,
under a removable cover in correspondence of the pilot seat.
The LG indication system is electrical and it is composed by the following main
components:
UP/DN limit micro-switches
(6 couples, 2 for each leg)
leg position lights, 3 green
(turned ON when the pertinent leg is extended and
locked and located on the LH instrument panel)
transition light, 1 red
(turned ON during transition phases)
(GEAR PUMP ON caution amber light turned ON
when the pump is electrically supplied)
(for landing gear red and green lights operational
check)
To Next Page
Loading...
