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of control
o WING/STAB LEAK – red light and has same sensing system as pneumatics
o Tested through FIRE DET system – should get WING/STAB HT OK
8
Engine Fire Detection System
Any element in the system will trigger alert.
FIRE indications on ITT and RMU (remains until resolved)
Extinguishers – 2 bottles in tail cone which can fire to either side (pressure guage 400-
800 psi on each bottle)
Side of tail cone to see condition – yellow light blows with manual discharge / red
light blows with thermal discharge of bottle out the red vent line
FIRE PUSH – arms bottles to fire to selected side
Also closes fuel, hydraulic, bleed air, T/R disables ignitors, T/R control,
generator, alternator, etc.
Button will show CLOSED – means (FWSOV) closed when armed
Armed – push to discharge - fires into nacelles not into engine
If FIRE light continues – use 2 bottle
Hydraulics
Gear and Gear doors, Brakes, Spoilerons, Flaps and Thrust Reversers
Reservoir – pressurized by bleed air and temp controlled
- separated into Main and Aux system that have a dedicated reserve once you go below
a certain level
- pressurized to prevent cavitations (bubble)
- either side L/R can provide all pressure needed to maintain manifold pressure for
filters
Main or Aux will provide hydraulic pressure to Brakes (whichever is higher)
Aux Pump – DC operated runs conditionally to supply emergency braking
- automatically runs when you select gear down
- controlled by brake handle
- charges the brake accumulator (Aux is only pump that charges B ACCUM)
CrossFlow Valve – opens with Aux Hyd Pump is on inflight
- enables Aux system to supply the gear and flaps
- inhibited on the ground or in case of low level
- if used inflight, not more than 20° Flaps (due to aux pump capability)
Preflight – panel is below Right engine (need battery on) shows reservoir levels before flight
L HYD Pump Low – illuminates when pressure drops below 1900 psi
MAIN HYD PRESS – if pressure < 1500 OR >3800psi
AUX HYD PUMP LO – pressure < 1900 psi
9
Landing Gear
Dual wheels on main gear – hydraulic/electric
Doors close hydraulic
Brakes activated electrically by wire with hydraulic actuators
Single wheel on nose gear with steering electrically by wire
Main gear actuator uses Down lock that is internal to actuator
Trailing link system with WOW/Squat switches in the scissor
Inboard door is closed with gear down
NO Uplocks – gear lays on gear inboard doors which have mechanical up locks
Gear is anti iced on retraction by wing/stab exhaust for bleed air into wheel wells.
Nose gear has self centering cams after lift off before retraction
Nose gear doors are mechanically closed with a traditional up lock switch
Down lock is built in internally to actuator
Retraction – 5 Sec with main pump / 15 Sec with Aux pump
Extension – choose gear down which raises main gear off doors first then doors open and
gear moves down followed by inboard door closing
o If doors don’t close then you get a cross hatched position on main gear
indicator
o Cross hatching on Nose gear means in transition (not door problem)
o 10 Sec with Main pump / 30 Sec with Aux pump
Free Fall – recommended in lieu of Aux pump
- use free fall lever which changes switches and drops gear mechanically
- main doors will stay open and you should get a cross hatched pos on main gear
- nose gear should not show cross hatched
- have to put free fall handle into forward position
Aux Extension – use Aux Hyd Pump and Crossflow Valve to extend using hydraulics
Nose Wheel Steering – controlled by steering servo actuator
- steer by wire activated by rudder pedals and travel distance
- you have up to 60° turn angle at 0 airspeed which degrades to 0° at 90 KIAS
- nose squat inhibits steering after retraction
- MSW will turn nose steering off
- NWS FAIL – can still maneuver with differential braking but nose gear will turn
in “caster mode” up to 90° (Past 80° you can’t stop turn)
Brake by Wire – very efficient – no mechanical influence
- top of pedals are brakes
- whoever presses hardest has the brakes between captain and co-pilot
- Brake control unit monitors pressure to react and send info to actuators
- Brake wear is monitored by pins with parking brake applied, if you can’t see it
you won’t have full capability
- Aux Hydraulic Pump has safety reserve to supply pressure to Emergency Brake
Accumulator (handle) OR it can supply hydraulic pressure for brakes (not both)
　
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