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1. Fault Isolation
Fault isolation locates the source of system failure at the black box or aircraft wiring
level. Fault isolation is typically performed on the ground in response to failures
indicated during post-installation checkout, preflight testing, or flight operation.
Perform the System Performance Check (Paragraph
) and refer to the Fault Isolation Checklist (Paragraph
fault isolation in the KHF 1050 HF system.
2. System Performance Check
The system check detects problems in the installation that may cause the HF system
to fail, to degrade performance, or cause damage to the HF system, such as:
•
Intermittent or improperly connected cables or connectors.
•
Defective units.
•
Poorly regulated aircraft DC power.
•
Poor grounding of KHF 1050 HF system or poor aircraft bonding.
•
Audio ground loops.
•
RF interference.
CAUTION: POWER CARTS MAY REGULATE POORLY WHEN SUBJECTED TO
STRONG RF FIELDS. IF MORE THAN 20% FLUCTUATIONS IN
POWER CART VOLTAGES ARE NOTED WHEN TRANSMITTING, DO
NOT CONTINUE TESTING WITH POWER CART.
CAUTION: SOME INTERMITTENT CONDITIONS MAY CAUSE OUTPUT
TRANSISTORS TO FAIL, THEREFORE TRANSMIT ONLY AFTER
OTHER CHECKS HAVE SUCCESSFULLY COMPLETED.
Perform the steps in the stated sequence.
Revison 2
N
KHF 1050 SYSTEM INSTALLATION MANUAL
TESTING AND FAULT ISOLATION
"2. System Performance Check"
"3. Fault Isolation Checklist"
23-10-09
) for
Page 1001
Apr/2006
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