Mod 7.7 (10) Flashcards
The term a/c electrical installation is of the single wire type means?
Only one wire is used to support the supply of electric current to the the user, with the return path via the structure.
Which intrument is used to check dead circuits?
A continuity checker is used to check dead circuits.
What must a megger never test?
Electronic equipment.
Two ways in which electrical energy can build up on an aircraft?
Precipitation induction.
Electrostatic induction.
What can be said of a bonding system?
Bonding limits the potential difference between all parts
Reduces intererence
Aids in effectiveness of shielding
Method of refueling an aircraft?
Bonding aircraft to the ground.
Bonding tanker to the ground.
Bonding aircraft to the tanker.
Bonding hose nozzle to a point on the aircraft.
After instalation of a ground point, resistance measurement is carried out between?
The terminal and the structure.
On a bonding meter when 60ft lead is held clear and the 6ft double prongs are bridged together:
The maximum resistance is indicated.
The scale of a bonding meter is graduated in divisions of?
0.002 omhs
How many dots when crimping a white terminal?
2 dots.
The maximum number of terminations a single stud can accomodate is?
4
The configuration of 3 terminals placed on a terminal strip is?
Terminal Down
Terminal Down
Terminal Up
On terminal strips the terminal may be bent to a max of?
30º
How many inches from a connector shall dead-ending take place?
4-6 inches from a connector, dead ending will take place.
What wires require an engineering approval before the can be repaired?
Coaxial cables.
Shielded wires and cables.
What is the maximum allowable amount of splices in any wire segment?
2 is the maximum amount of splices in a wire segment.
The Burndy M10S-1 consists of what 3 parts?
Tool
Die
Locator
How are contacts of a module block labelled?
Upper contacts are labelled ‘A’
Lower conatcts are labelled ‘x’
What would you use to protect connectors against corrosion?
WD-40
What systems are critical in length and can’t be repaired?
ADF Sence antenna
Low range radio altimeter
How to reduce effects of EMI?
Physical seperation of the wire bundles.
Categorising each wire according to the type of energy carried by it.
How is the spacing for clamping of wire bundles?
Every frame.
What areas would you not use plastic ties or straps?
On Coaxial cables.
On high temperature areas.
What is the limitation for the spacing of clamps?
24 inches
What is the limitation on making ties using lacing cord?
Ties are required every 8 inches.
In high temperature areas, every 2 inches.
What can be said about shielded cables under 50khz?
They are grounded at one end.
When installing a clamp on a wire bundle?
The mounting screw should be above the wire bundle when installing a clamp on a wire bundle.
WD-40 should not be used where?
In high temperature areas.
In a rear release system which side does the connector get installed and removed from?
In a rear release system the contacts are installed and removed from the rear of the connector.
Nylon clamps should not be used in?
Areas exceding 250ºF.
Plastic ties may be used in what areas?
Plastic ties may be used in pressurised areas.
If wire bundles run above or beside pipes carrying flammable material, can you support it with said pipe?
No, bundle clearance must be maintained by another means.
How is the choice of clamp determined?
Location,
Enviroment,
Bundle Size.
How are Raychem contacts for module blocks coded?
Raychem contacts are colour coded.
What type of wire uses contacts without colour coding?
AN wire with fibreglass insulation.
What measurement points should be used when performing a bonding test of a terminal installed at a ground stud?
The aircraft primary structure and the terminal.
Proir to use the prongs on a 2 pronged probe of a bonding meter are shorted together. What will the meter indicate?
The bonding meter will indicate maximum resistance.
What is the maximum number of terminations a single stud can accomodate?
4
The lower 2 contacts in a module block are labled?
X.
In order to reduce EMI in wire bundles, how are wires categorised?
According to the type of energy being carried
and
According to its ability to act as a reciever/transmitter.
Individual wire groups within a wire bundle should be?
Spot tied together within the bundle.
How far apart are high vibration spot ties placed?
Every 2”.
Where is a single cord lacing aloud?
Inside boxes.
The dead-ending of connectors shall take place?
4”- 6” from a connector.
Splices shall not be within how many inches of a terminating device?
12”.
On terminal strips a,terminal may be bent to a maximum of?
30º.
What is the maximum allowable angle to which a terminal tongue may be bent?
The maximum allowable angle to which a TERMINAL TONGUE can be bent is 90º AWAY from the barrel.
When intalling terminals on a terminal strip?
Washers must be placed between terminals of different sizes.
End caps for dead-ending and stowing of un used wire are?
Crimped over the un-stripped wire end.
Stowed wire must be?
Visible from outside of the wire bundle.
What determines the type of splice used on the aircraft?
The enviroment to which the splice may be installed.
What is the maximum number of splices that may be installed on a wire?
2 spliced per wire maximum.
What item can be used when testing a live circuit for continuity?
A Voltmeter.
What test instrument is most suitable for continuity checking?
An Ohmmeter.
Which type of aircraft equipment must not be meggered?
Equipment containing semi-conductors.
What is the function of static dischargers in a bonding system?
They provide a low interference path for static charge dissipation into the atmosphere.
When using a rear release insertion /extractoin tool?
The contact shall be inserted and extracted from the rear of the connector.
In the WDM, how are lower case letter written?
- -A
- uA
- A
What material should be used to clean co-axial connectors?
Solvent Freon.
