Airframe/AVCS

Question 1

How much play is allowed at the stabilator trailing edge center behind the actuator?

Answer 1

Stabilator and Stabilator Actuator Attachment Fittings Inspection Stabilator Free Play Inspection

STEP 2.Check up and down free play at stabilator trailing edge center directly behind actuator (Figure 2, Sheet 1, Detail A). TOTAL VERTICAL MOVEMENT SHALL NOT BE MORE THAN 3/16 (0.1875)-INCH.

Question 2

What maintenance action is to be performed if cracks are found on the center stabilator upper or lower plating?

Answer 2

Center Stabilator Plating Inspection

Visually inspect center stabilator upper and lower plating for cracks. IF CRACKS ARE FOUND, REPLACE CENTER STABILATOR (WP 0623).

Question 3

Describe the characteristics of the transition section avionics shelf?

Answer 3

Transition Avionics Shelves - Shelving located in the aft transition section allows the installation of multiple avionics and electrical processors and control boxes.

· The shelving is conductive and care should be taken when removing and installing so as to ensure proper electrical bonding of equipment mounts, shelving, and surrounding airframe structure.

· Shelving is not designed to support body weight and should be removed if access to tail boom is required.

Question 4

The UH-60M E3 hardening encompasses what?

Answer 4

All electromagnetic disciplines

Question 5

The EE seal is mostly made of what?

Answer 5

Silicone Elastomer

Question 6

The windshields have been changed to what type of material?

Answer 6

Polycarbonate

Question 7

The Nose compartment deck floor has been reinforced to support what?

Answer 7

Embedded GPS/INS (EGI) mounts

Question 8

What is the fundamental principle of the stabilator system?

Answer 8

No single sensor can cause motion in both channels of the system.

Question 9

The AVCS system consists of what components?

Answer 9

The system consists of the following:

· AVC Computer, in the antenna well

· EU, in the antenna well

· Accelerometers

Question 10

The computer BIT function of the AVCS can isolate a fault to what level?

Answer 10

The computer contains BIT capability which can isolate a fault to the component level.

Question 11

Where are the two lateral accelerometers located for the AVCS?

Answer 11

· Lateral accelerometers, pilot seatwell

· Lateral accelerometers, right aft cabin

Question 12

What does the Active Vibration Control System (AVCS) consist of?

Answer 12

The AVCS consists of:

Active Vibration Control Computer (AVCC) that processes vibration sensor signals and provides command signals to the AVCS Electronic Unit (EU). 10 accelerometers solely dedicated to the system. 3 Force Generators capable of dampening out ACFT vibrations.

Question 13

What converts AVCC data into drive commands and sends the data to the appropriate Force Generators (FGs) to generate forces at the appropriate frequency and phase that damped or cancels cockpit and cabin vibrations?

Answer 13

The AVCS Electronic Unit (EU) converts AVCC data into drive commands and sends the data to the appropriate Force Generators (FGs) to generate forces at the appropriate frequency and phase that damped or cancels cockpit and cabin vibrations.

Question 14

The AVCC contains built-in testing (BIT) capability, which can isolate a fault to what level?

Answer 14

Component Level

Question 15

How many airframe accelerometers are used to measure vibration throughout the helicopter cabin?

Answer 15

10 airframe accelerometers (8 vertical and 2 lateral).

Question 16

Where will an AVCS INOP advisory appear when the system is not operating?

Answer 16

On the EICAS display, bottom left-hand corner

Question 17

What provides the major cross-sectional structure for the UH-60M airframe?

Answer 17

Frame

Question 18

What are the advantages of High-Speed Machining?

Answer 18

Enhances structural rigidity.

Decrease manufacturing time.

Reduction of total parts

Question 19

How are the UH-60M systems and subsystems protected from electromagnetic environment?

Answer 19

By creating shielded volumes, and grounding/bounding equipment.

Question 20

The bonding of aluminum mesh is a method utilized to provide E3 harding.

Answer 20

True

Question 21

0.032” electrical wire is required to “safety” the cockpit door jettison handle.

Answer 21

False non electrical 0.020

Question 22

When inspecting the Pilot’s and Co-Pilot’s seat buckle the ___________________.

Answer 22

buckles must have the same type of release mechanism

Question 23

The forward cabin structure _______________________.

Answer 23

consist of the framing between STA 247 and STA 308

provides attachment points for the landing gear

is considered a primary structure

Question 24

The use of the Martin Baker seats __________________________________.

Answer 24

requires AWR 1465 for use

Question 25

All tail cone framing, fittings, bulkheads, and plating are considered a primary structure.

Answer 25

True

Question 26

The spanner wrench for the stabilator can be found in ______________.

Answer 26

aircraft fold kit and PGSE kit.

Question 27

Each stabilator actuator ______________ provides feedback to the respective FCC.

Answer 27

potentiometer