FLIGHT CONTROLS AND HYDRAULIC SYSTEM Flashcards Preview

The UH-60 flight controls system consists of the

_____, _____, _____ subsystems.

Control inputs are transferred from the cockpit to the rotor blades by ______ _____ and assisted by _____ _____. 

Pilot control is enhanced by a ____ ____ system (_ _ S),

a ____ ____ system (_ _ S), and an ____ ____ system.

Dual cockpit controls consist of the ____, ____, and ___ ___ pedals.

The pilot and copilot’s controls are routed separately to a

____ ____ for each control axis.

Output from the cockpit controls is carried by ____ ____, through pilot assist ____, to the ____ unit.

The mixing unit provides ____ inputs, through ____ linkages, to the ___ and ___ rotor controls.

The collective control system provides

_____ helicopter control.

The primary collective servos, raise or lower the main rotor ____ , causing the pitch angle of all blades to change

_____. 

Boost servos are located.....

Order of boost servos in the hydraulic compartment.

Boost servos make it easier for the pilot to:

This mechanical mixing unit

The _____ servos control the non-rotating swashplate, allowing the pilot to control the ____ rotor system.

The cyclic control system provides ____, ____, and ____ control of the helicopter. 

When trim is engaged, the ___, ___, and ___ trim systems are activated to maintain the position of the ___ and ___ rotor controls. 

SAS servos are electrically controlled, _________ actuators, designed to provide enhanced stability in the ___, ___, and ___ axes.

The tail rotor (directional) control system determines the helicopter’s heading or ___ by controlling the ____ of the tail rotor blades.

The UH-60 uses a tail rotor servo assembly, which consists of ______ independent stages

arranged in a ______ configuration for redundancy. 

The assembly is mounted in the ___ gearbox. 

The first stage tail rotor servo is normally pressurized  by the ___ hydraulic system.

In the event that a malfunction or leak occurs, the TAIL SERVO switch can be selected to ______, at which point the ____ hydraulic pump would provide pressure to operate the second stage of the tail rotor servo.

In the event both cables break, the ______ spring places the pilot valve in a position that provides a positive tail rotor pitch of ___° (assuming at least one tail rotor servo is pressurized).

There are ___ redundant main hydraulic systems supported by _____ hydraulic pumps, and an _____ powered backup pump that can pressurize both main systems (simultaneously).

The #__ pump module supplies first stage primary servos and the first stage ____ ____ servo.

The #__ pump module supplies second stage primary servos and ____ ____ servos.

The ____ pump module supplies the ____ stage tail rotor servo, and recharges the ___. 

As a contingency, it can also supply ___ or ___ stage hydraulic loads.

Two ______ _____ connect the hydraulic pressure outputs of the #1 and #2 pumps to the various flight control hydraulic components. 

Both hydraulic pump transfer modules are

_____ and _____.

The two transfer module _____ are not interchangeable.

Pilot assist servos assist the pilot to overcome forces induced by the _____ system.

There are:

• three ____ servos: ___, ___, and ____
• three ___ servos
• a ___ ___ servo.

The backup hydraulic system supplies pressure through the utility module to the ______ stage tail rotor servo, and it recharges the ___ accumulator following APU starts. 

The backup hydraulic system also supplies pressure to the #1 and #2 ______ modules to operate all servos normally supplied by the #1 and #2 ______ systems when those systems are not operational.

APU accumulator supplies a _____-psi hydraulic charge to the APU start motor. 

Hydraulic fluid in the accumulator is used to compress a charge of _______. 

The APU accumulator holds a nitrogen precharge of about ____ psi.

During the recharge cycle the accumulator is automatically pressurized to approximately ____ psi (± ___).

When the accumulator nitrogen charge drops to about ____ psi, the APU ____ ___ advisory light will illuminate, and the backup pump will automatically come on.