©1999 Navia Aviation AS 21833-3.4 Corrective maintenance
OPERATING MANUALNORMARC 7013
INSTRUMENT LANDING SYSTEM
7-9
A maintenance warning on a board listed in the following table indicates that there is a fault on
that board.
7.4.3.2.4 Power amplifier tests
DIAGNOSTIC ALGORITHM:
Warnings on a PA implies PA failure if there is no warning or error on the corresponding OS or
LF.
DESCRIPTION:
The algorithm assumes that a warning indication on any of the measurements on a PA means
there is a failure on this PA, if the corresponding OS and LF have no maintenance warning
indications. (A fault on the OS and LF may cause a warning on the PA.)
7.4.3.2.5 Monitor 1 and 2 frontend tests
DIAGNOSTIC ALGORITHM:
Warning on monitor frontend 1 implies monitor frontend 1 failure if there is no warning on mon-
itor frontend 2 and vice versa.
DESCRIPTION:
The maintenance measurements from the monitor frontend boards will be affected by the
monitor input signals, i.e. the diagnostic algorithm can not use these measurements alone to
reliably diagnose fault on the monitor frontend boards. The algorithm assumes that both fron-
tends are fed the same input signals. If a maintenance warning then exists on one, but not
both of the boards, this board is assumed to be faulty. If maintenance warnings exists on both
boards no knowledge is gained about monitor frontend health status.
7.4.3.2.6 Remote control tests
DIAGNOSTIC ALGORITHM:
If there is a “RC link status” warning, there is a problem with the remote control or its data link.
DESCRIPTION:
A warning on the RC link status indicates that the TXC does not receive valid data from the
remote control unit.
7.4.3.2.7 Transmitter control tests
DIAGNOSTIC ALGORITHM:
TX control “EPROM check” or “Integrity check” warnings indicate a failure on the TXC board.
7.4.3.2.8 Standby monitor tests
Board
LF generator 1 or 2
Oscillator 1 or 2
RMS board
Monitor 1 or 2
TX Control board
User defined inputs
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