Honeywell International Inc. ALA-52B2 Manuale Utente
COMPONENT MAINTENANCE MANUAL
Part No. 066-50007
(2)
The ALA-52B is part of the Honeywell ALA-52B Radio Altimeter System. The
ALA-52B is a lightweight, solid-state, digital airborne altimeter designed to provide
accurate, digital height measurements above terrain during aircraft approach, landing,
and climb-out phases. It is a low-range altimeter that incorporates two different and
independent microprocessors, one of which performs the primary altitude computation
while the second independently verifies the computation by comparison.
ALA-52B is a lightweight, solid-state, digital airborne altimeter designed to provide
accurate, digital height measurements above terrain during aircraft approach, landing,
and climb-out phases. It is a low-range altimeter that incorporates two different and
independent microprocessors, one of which performs the primary altitude computation
while the second independently verifies the computation by comparison.
2.
Configuration
(TASK 34-42-37-870-802-A01)
A.
Overview
(Subtask 34-42-37-870-002-A01)
(1)
Table 1 lists the features contained in the ALA-52B. Table 2 contains a brief description
of each feature.
of each feature.
Table 1. ALA-52B Configurations
Features
Honeywell
Part Number
066-50007
Basic Unit
Fault Memory
CMC
Compatible
Maximum
Weight (Lbs/Kg)
-1111
X
X
X
8.6/3,9
Table 2. ALA-52B Features
Feature
Description
Basic Unit
Airborne solid-state radio altimeter that incorporates
two different and independent microprocessors, one
of which performs the primary altitude computation
while the second independently verifies the
computation by comparison. The altitude information
is supplied to the AFCS and height displays on the
instrument panel. The front panel contains LEDs
that indicate the operating status of the unit. The
front panel also provides a user interface for test
and troubleshooting, including a test button and an
RS-232C 25-pin “D” connector. The RS-232 front
panel connector is used for testing the ALA-52B
through a front panel adapter.
two different and independent microprocessors, one
of which performs the primary altitude computation
while the second independently verifies the
computation by comparison. The altitude information
is supplied to the AFCS and height displays on the
instrument panel. The front panel contains LEDs
that indicate the operating status of the unit. The
front panel also provides a user interface for test
and troubleshooting, including a test button and an
RS-232C 25-pin “D” connector. The RS-232 front
panel connector is used for testing the ALA-52B
through a front panel adapter.
Fault Memory
A nonvolatile, single-chip fault memory that allows
the recording of faults associated with a particular
flightleg. Sixty-four flight legs are available with each
flight leg made up of a flightleg information header
containing a fault record section for recording ten
airborne faults and three ground faults. When all
flight legs are used, the oldest flight leg is reused.
the recording of faults associated with a particular
flightleg. Sixty-four flight legs are available with each
flight leg made up of a flightleg information header
containing a fault record section for recording ten
airborne faults and three ground faults. When all
flight legs are used, the oldest flight leg is reused.
CMC Interface
The ALA-52B interfaces fault memory and BITE
data between radio altimeter and line maintenance
CMC for the purpose of extracting maintenance
information and initiating tests. Designed to conform
with ARINC 429 interfaces, and ARINC 604.
data between radio altimeter and line maintenance
CMC for the purpose of extracting maintenance
information and initiating tests. Designed to conform
with ARINC 429 interfaces, and ARINC 604.
EFFECTIVITY
ALL
34-42-37
Page 2
10 Oct 2007
© Honeywell International Inc. Do not copy without express permission of Honeywell.