Hyd SYS - 2 Flashcards
where is the pedal adj handle?
on side of instrument panel
outputs from the cockpit controls are carried by mechanical linkage through the pilot assist servos
MMU
which panel has the tail servo and backup hyd switches
misc sw. panel
The MMU is designed to reduce
INHERENT CONTROL COUPLING
Name the four mechanical mixes provided by the MMU
Collective to: Pitch/roll/yaw
AND
Yaw to Pitch
Describe collective to pitch
MMU put fwd input to rotor disk to prevent nose-high attitude
Collective to yaw
MMU inputs left pedal to compensate for torque effect
Yaw to pitch
Aft input to M/R system as T/R pitch is increased. It compensates for vertical thrust
Collective/Airspeed to yaw
As collective and A/S increase, T/R pitch is decreased and vise versa
Collective to roll
MMU makes left rotor disk to compensate for translating tendency.
The SERVO OFF switch has an __ ___ to prevent both servo stages from being turned off
electrical interlock
5 lights that have to come on for backup pump to come on?
"ROY HAS TO HURRY AWAY " #1 Reservoir #1 Hyd pump #1 T/R Servo #2 Hyd pump Accum low
With a leak, it takes how many seconds to lose both systems?
11-13
Servos are the only thing that can ___
jam or hardover
How long does the MMU minimize inherent control coupling?
by combining, summing and coupling collective pitch, roll and yaw inputs
What is the only trim actuator that receives hydraulic power from the number 2 hyd system
Pitch control
why is collective/airspeed to yaw mixing completely phased out when the airspeed is above 100kts
efficiency of the T/R and the cambered fin
Moving servo off SW from norm to 1st stg or 2nd stg will
turn off that stage of servos
What is the reason for the depressurization valve to only connect to the backup pump?
to reduce output pressure of the pump upon startup of the electric motor
the #1 hyd system supplies hyd fluid through its xfer module to what servos?
1st stage primary servos and first stage tail rotor servo
Hyd leak test sw. allows testing of the _?
LDI
What hyd pump is the depressurized valve on?
Backup hyd pump
the rsvr 1/2backup low caution illuminates when?
when there is 60% fluid remaining in the reservoir (leak in the system)
if a tail rotor cable breaks, what caution and/or advisory would appear?
T/R quad fail caution
the #2 hyd system supplies pressure through the transfer mod to what servos?
2nd stage primary servos and the pilot-assist servos
appearance of the boost servo off caution indicates?
loss of hyd pressure to the collective and/or yaw boost servo
what is the purpose of the APU accumulator?
provide hydraulic charge to the APU starter motor
in flight the backup pump mode automatically sets to ?
the auto mode is even on if the switch is in the off or on position
what does the backup pump supply pressure to?
1 and/or #2 hyd system, 2nd stage tail rotor servo and APU accumulator.
Name the trim actuators
yaw, roll, collective, pitch
what FCC drives the trim actuator
FCC #2
utility module
directs flow of pressure from the backup pump to the number 1/2 transfer module second stage tail rotor and apu accumulator.
what piece isolates the primary servos?
located on the?
primary shutoff valve
transfer mods - after moving servo off sw.
(think primary servos primary shutoff valve)
