Module 5.14 Typical Electronic/Digital Aircraft Systems (1of2)

Request edit access

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

Sub-Module 14 -Electromagnetic Environment :Influence of the following phenomena on maintenance practices for electronic system: EMC- Electromagnetic Compatibility ,EMI-Electromagnetic Interference
HIRF-High Intensity Radiated Field, Lightning/lightning protection

Email *

In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed.

1 point

0.05 ohm.

1 ohm.

1 megohm.

Ribbon cables effected by mutual impedance and current loop leakage should be protected by.

1 point

earthing each alternative conductor to separate point.

connecting all conductors to a common earth.

shielding each individual conductor.

To shield a fibre optic from EMI you must.

1 point

earth both transducer and couplings.

shield it with a braided shield.

use an opto-isolator.

Manufacturers of aircraft can ensure HIRF protection by.

1 point

advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc.

designing specific avionic areas that are shielded against HIRF.

ensuring all single wires are shielded with metal conduit.

Which of the following could be a primary cause of HIRF protection failure?.

1 point

Broken or missing static wicks.

Corrosion on bonding leads.

Unserviceable radio filters.

Manufacturers of aircraft can ensure HIRF protection.

1 point

by designing specific avionic areas that are shielded against HIRF.

by ensuring all single wires are shielded with metal conduit.

by advising the operator of parts of the aircraft susceptible to degradation due to corrosion, moisture ingress, flexing etc.

HIRF protection of LRUs is provided by.

1 point

internally shielded cables.

built in filters and overvoltage circuits.

built in filters only.

To stop earth loops forming, you would.

1 point

earth both ends of the cable screen.

leave both ends of the cable screen open circuit.

earth only one end of the cable screen.

An aircraft may have been HIRF affected.

1 point

A bonding load check is required.

A static wick check is required.

Test all radio frequencies for interference.

Testing of HIRF on aircraft systems is done.

1 point

by periodically listening for interference on all systems.

at and during production and testing (initial certification).

only after a report of radio interference.

When carrying out a bonding check on a surface protected by anodic film.

1 point

the film is conductive so no preparations are required.

the anodic film should be removed locally to ensure a good contact.

add a bonding factor to the result of the test to account for the resistance of the anodic film.

When clamping cable looms containing co-axial cables.

1 point

avoid distortion to the co-axial cable to maintain the dielectric constant.

the clamps must be no more than 1 metre apart.

distortion of the outer sheath is allowed providing the inner cable is not affected.

When incorporating an aerial cable it must be.

1 point

in the centre of the other wires.

outside the other wires for easy access.

positioned separately from the loom.

When carrying out airframe bonding checks as part of a program of HIRF prevention the airframe bonding resistance should be less than.

1 point

Option 1

Option A. 100 milliohms.

1 ohm.

50 milliohms.

Electromagnetic compatibility is achieved by.

1 point

shielding, screening, earthing, bonding and interference filters.

coating in a conductive paint.

enclosing the system with same frequency and strength of which screening is done.

To reduce HIRF on radio equipment.

1 point

ensure all static wicks are in place.

periodically check bonding leads for condition.

transmit on all radio frequencies to determine which frequencies are causing the interference.

For braided cables, the amount of braiding.

1 point

must conform to the requirement for the shielding to cover at least 50% of the surface of the cable.

keeps radiated power inside the emitting assembly or away from the susceptible circuit.

is a trade-off design feature.

HIRF is acronym for.

1 point

Heavily Ionised Radio Frequencies.

High Intensity Radiated Field.

High Intensity Radio Frequencies.

HF aerials are protected against lightning strike by.

1 point

current mode coupler.

bus terminal.

spark gap.

Submit

Clear form

This form was created inside of amepreparation.com.

Does this form look suspicious? Report

Forms