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Chapter 5 > On Board Maintenance Systems > Flashcards

On Board Maintenance Systems Flashcards

1
Q

Intense parts of flight (4)

A

Take off & Landing
Hovering
Specific tasks (fast rope & air to air refuelling)
Unplanned tasks (missile avoidance)

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2
Q

What does OBMS stand for?

A

On Board Monitoring Systems

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3
Q

What is a fatigue meter used for?

A

Means of estimating the use of structural life

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4
Q

In regards to fatigue & health measurement, specific to helicopters. What is monitored?

A

Stress levels & vibration of the rotor head.

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5
Q

What were the problems with early basic forms of monitoring?

A

Parameters were crude leading to wasteful over estimates

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6
Q

What is used in fatigue monitoring to account for different types of flying?

A

Sorti Profile Codes, which add a multiplication factor to flying hours.

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7
Q

9 things that affect the aircraft’s serviceability & ultimate life.

A
  1. Manoeuvres - pulling g baby!
  2. Ground-Air-Ground (GAG) 🍆😲🤮
  3. Mass & CoG
  4. Cabin pressurisations
  5. Control Surface usage
  6. Propulsion loads
  7. Launch loads
  8. Thermal & acoustic effects
  9. Other aerodynamic effects (gusts & turbulence)
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8
Q

What are some of the shortcomings of fatigue meters? (4)

A

Can not account for all loads
Reliant on manual recording
No time base
Require calibration

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9
Q

How many parameters can the HUMS system on a chinook record?

A

136

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10
Q

What is the purpose of OBMS for electronic control systems? (4)

A
  1. Interrogate own system for condition & serviceability
  2. Info to aircrew on ground & in air
  3. Indication of failures & degradation
  4. Move system over to redundancy path in event of failure
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11
Q

What is BITE?

A

Built in testing equipment

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12
Q

What ability’s does BITE provide? (2)

A

Self diagnostics

Determine serviceability

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13
Q

What is BIT?

A

Initial start up.

Determines serviceability before taking off.

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14
Q

What is CBIT?

A

Continuous test

Continuous self-diagnostics through sorti

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15
Q

What is IBIT?

A

Interruptive test

Allows deep diagnostic post-sorti

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16
Q

What is a FDR?

A

Flight data recorder

17
Q

What is a BAU?

A

Beacon Aerofoil unit

18
Q

What will a BAU transmit after separation from air system?

A

Distress signal,
Aircraft identification,
Last known location

19
Q

What does a transducer do?

A

Converts a signal in one form of energy to a signal of another.

20
Q

3 examples of inputs to a transducer?

A 
Microphone 
Thermocouple 
Potentiometer 
Photo electric cell
Strain gauge 
Piezo electric
21
Q

Types of output from a transducer?

A

Analogue
Discrete
Digital

Chapter 5 (1 decks)

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