Flight Controls And Hydraulics

Question 1

Define DASH

Answer 1

Differential Airspeed Hold

Question 2

Define ILCA

Answer 2

Integrated Lower Control Actuators

Question 3

Define CCDA

Answer 3

Cockpit Control Driver Actuator

Question 4

Define CPT

Answer 4

Control Position Transducer

provides position and rate-of-change information to CAAS

Question 5

Define DCP

Answer 5

Differential Collective Pitch

Question 6

What component improves control feel by reducing control sensitivity?

Answer 6

Viscous damper

Question 7

How many flight Control Hydraulic Systems does the CH 47 have?

Answer 7

2

Question 8

When can the Hydraulic Service Module be used to add fluid to the hydraulic systems?

Answer 8

Anytime

Question 9

What is the purpose and location of the #1And #2Flight Hydraulic Reservoir/Coolers And Fans?

Answer 9

FWD & AFT pylons, cool and store excess hydraulic fluid

Question 10

What is the purpose and location of the #1And #2 Flight Hydraulic Pumps?

Answer 10

1- right side of FWD XMSN

#2- left side of AFT XMSN

keeps fluid pressurized in their respective system, each pump pressurizes half of both upper dual boost actuators on the FWD and AFT rotor systems

Question 11

What is the purpose and location of the #1And #2 Flight Hydraulic power control modules?

Answer 11

FWD & AFT Pylon/Controls pressurized and return fluid for their respective systems

Question 12

The lower control pressure control modules (LCPCMs) reduce pressure from ______ psi to ______psi for the operation of the____________.

Answer 12

3,000 psi
1,500 psi
ILCAs

Question 13

What must be done if a jam indicator is found extended on preflight?

Answer 13

Contact maintenance

Question 14

What is the purpose and location of the upper dual boost actuators?

Answer 14

Underneath the Forward and aft swashplates, transmit input into the swashplates (pivoting and swiveling UDBA)

Question 15

What are the two sides of a PTU and what are their purpose?

Answer 15

Utility hydraulic side and flight hydraulic side

allow utility hydraulic system to pressurize flight hydraulic system

Question 16

When will the flight hydraulic pumps provide hydraulic pressure to the system?

Answer 16

When the rotors are turning

Question 17

What are the two drains on the flight hydraulic pumps and the purpose of each?

Answer 17

Seal drain- allows fluid to drain if a leak develops from either the transmission or the pump

Case drain-cooling and lubrication (1 gallon per minute, fault at 2.5 gallons per minute)

Question 18

What does the HYD 1 or HYD2 FLT CONTR caution indicate?

Answer 18

A loss of pressure and/or fluid in the respective hydraulic system

Question 19

If the HYD FLT CONTR caution is active, what other caution will also be active?

Answer 19

Associated AFCS caution

Question 20

The No.1 and No.2 flight hydraulic systems are identical. They are _________ in operation, ________ separated, and __________ integrated.

Answer 20

Parallel in operation, hydraulically separated, and electronically integrated

Question 21

Where are the accumulators for the No 1. And No 2. Flight Hydraulic Control Systems located?

What do they do?

Answer 21

They are located on the pressure control modules for their respective systems, in between the return filter and pressure filter.

They dampen low frequency pressure surges and provide stored hydraulic power for peak loads.

Question 22

What hydraulic psi is supplied by the engine starter system for normal engine starts?

Answer 22

3,350 psi

(3,000 psi from the utility hydraulic pump is sufficient in other than normal conditions)

Question 23

Answer 23

Power Control Module

Question 24

Answer 24

ILCA Manifold

Question 25

Answer 25

Power Transfer Unit

Question 26

Answer 26

Flight Hydraulic Pump

Question 27

Answer 27

Lower Control Pressure Control Module

Question 28

Answer 28

Integrated Lower Control Actuators

Question 29

Answer 29

First Stage Mixing Unit

Question 30

Answer 30

Second Stage Mixing Unit