4.3 Intro/Ops of E-28s

Question 0

What are the components of the arrester engine?

Answer 0

• Tape drum & capstan assembly
• Retrieve drive sprocket and bearing assembly
• Vaned rotor mounted on a common shaft assembled in a vaned housing.

Question 1

What is the mission of the E-28 gear?

Answer 1

It is emergency arresting gear designed as a land-based, emergency standby gear for all tail hook equipped aircraft.

It’s installed on the runway for the purpose of safely arresting an aircraft during an aborted take-off or an emergency landing.

Question 2

What are the components of the retrieve assembly?

Answer 2

• electrical starting system (12v for the 65 Hp engine)
• torque converter with front disconnect clutch
• speed reducer with duo-cam clutch
• control panel

Question 3

What is the function of the tape drum, shaft, & rotor?

Answer 3

To function as one unit during an arrestment–the tape drum drives the rotor, whose motion is resisted by turbulent fluid in the housing, decelerating the tape drum.

Question 4

Where is the tub housing installed?

Answer 4

Underground with fixed stators on the bottom and under the cover

Question 5

Retrieve drive sprocket assembly is what & does what?

Answer 5

Bearing mounted, on the shaft above the tape drum

Retrieve system is automatically disengaged from the tape drum through the action of cam release post acting against the automatic release mechanism

Question 6

What is the release mechanism spring loaded to?

Answer 6

6,000-6,500 lbs

Question 7

How is the sprocket driven?

Answer 7

Chain driven by a gasoline engine

Question 8

How is the retrieve system operated?

Answer 8

Manually engaged to the tape drum through contact of the armed spring loaded cam & cam release post

The tape drum and rotor run free of the sprocket assembly when the release mechanism is tripped

Question 9

What is the function of the retrieve system assembly components?

Answer 9

• Rewinds the tape and pre-tensions the pendant after each arrestment
• control panel monitors all operations of the retrieve system

Question 10

What is e purpose of the runway edge & deflector sheaves?

Answer 10

To serve as a guide for the nylon tape (purchase tape)

Question 11

Deck pendant

Answer 11

1 1/4 inch diameter non-rotating wire rope

Arresting hook engages the deck pendant causing tape to pay out and activate the arrester engine

Question 12

Tape connector

Answer 12

Connects the nylon tape to the deck pendant

Question 13

What is the function of the cooling system?

Answer 13

When the retrieve engine is running cool fluid from the tank is pumped into system causing heated fluid to be forced back to the cooling tank

Large exposed surface of the tank serves as a heat exchanger, dissipating excess heat to surrounding air.

Located near arresting engine

Question 14

Tape pressure roller

Answer 14

• Ensures even, tight wrapping of tape during retreive
• prevents over spin during arrestment
• tensioned by two springs extended by a hand winch

Question 15

Base cover

Answer 15

Protects tape from exposed ends of arrester engine or runway edge sheave hold down bolts

Question 16

Mounting base plate

Answer 16

Arrester engine assembly, deflector sheave assembly, pressure roller assembly and retrieve assembly are all bolted to a common base-plate

Question 17

What is another name for the Johnson Ball?

Answer 17

Arrest sign

Question 18

What is anger name for the arrest sign

Answer 18

Johnson Ball

Question 19

What is the purpose for the arrest sign (Johnson ball)?

Answer 19

• Indicates to approaching aircraft the location of the arresting gear
• It’s a bi-directional illuminated sign that’s inline with the deck pendant behind the cooling system
• universal marker (FAA approved)

Question 20

What does CDP stand for

Answer 20

Cross deck pendant

Question 21

What does PTWS stand for

Answer 21

Pre-tension warning system

Question 22

What is the PTWS used for

Answer 22

It provides continuous indication on the state of pretension on the deck pendant across the runway

Question 23

What happens if the pretension is lost on the deck pendant

Answer 23

The PTWS strobe light flashes (it faces the tower)

Question 24

What RPMs should you never exceed when you operate the 65 Hp engine

Answer 24

3,000 RPMs

Question 25

Where do you reference the pre-operational inspection of the E-28s?

Answer 25

MRC R-1D, card 67 791K N

Question 26

How is the clutch engaged?

Answer 26

With your left hand from left to right