Testing And Fault Isolation; System Performance Check; Operation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
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 2.) and refer to
the Fault Isolation Checklist (Paragraph 3.) for 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
CAUTION: SOME INTERMITTENT CONDITIONS MAY CAUSE OUTPUT
Perform the steps in the stated sequence.
Revision 0
10640I00.SLK
KHF 1050 SYSTEM INSTALLATION MANUAL

TESTING AND FAULT ISOLATION

RF FIELDS. IF MORE THAN 20% FLUCTUATIONS IN POWER CART
VOLTAGES ARE NOTED WHEN TRANSMITTING, DO NOT CONTINUE
TESTING WITH POWER CART.
TRANSISTORS TO FAIL, THEREFORE TRANSMIT ONLY AFTER
OTHER CHECKS HAVE SUCCESSFULLY COMPLETED.
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23-10-09
Page 1001
Mar/2003