Honeywell MKXXII Category 8, Radio Altitude Input Select, Radio Altitude Type Table E Description

Honeywell

MK XXII EGPWS Installation Manual

E 5.3.8 CATEGORY 8, RADIO ALTITUDE INPUT SELECT

The following table provides identification of the Radio Altitude type. The entry in the Radio Altitude Type corresponds to a table that provides detailed information on the configuration. For example, the details for Radio Altitude Type #1 are found in Table 0-1. ARINC 552, ALT 55 and digital ARINC 429 compatible Radio Altimeters are supported. ALT 50 Radio Altimeters are not supported due to the maximum 2000-foot operation

CAUTION:

ALT 55 radio altimeters use an avarage altitude tracking technique that does not track the nearest terrain. This can produce errors up to 200 to 300 feet in high bank turns and mountainous terrain. This characteristic may degrade EGPWS performance for Modes 1 thru 6.

In this category, only the following signals are defined:

•Radio Altitude source selection, input scaling, and associated validities.

TABLE E 3.1.8: RADIO ALTITUDE INPUT SELECT FOR EGPWS MKXXII

ID

0

1

2

3

4

5

Radio Altitude

Type

(Table E 3.1.8-

x)

0

1

2

3

4

5

Description

Analog Radio Altitude (ARINC 552)

Analog (ALT 55)

Digital Radio Altitude (ARINC 429) (Note 2)

Analog Radio Altitude (RT-200/300)

Analog (KRA 405)

Analog (Alt 50)

Effectivity

App. Cfg.

-001 -001

-001 -001

-001 -001

-001 -001

-003 -003

-010 -010

Note 2: Digital Radio Altimeters can not be used on two engine Helicopters with Digital Torque.

SIGNAL

Radio Altimeter #1

TABLE E 3.1.8-0: RADIO ALTITUDE INPUT SELECT TYPE 0 (ARINC 552)

CONNECTION	SUMMARY DATA
(+) = J1-64	Format: ARINC 552 with Validity Flag
(-) = J1-45	Input Type: Basic
	Fault Designation: RADIO ALTIMETER FAULT
	Validity: Radio Altitude Valid Discrete #1 (+28V)

PIN FUNCTION	CONNECTION	PIN TYPE	CHANNEL DESIGNATION	Polarity/Configuration
			REFERENCE
Radio Altitude Validity	J1-29	Input	28V_DISC_07	>+17V = Valid
Discrete #1 (+28V)				<+4.4V = Invalid
DH Discrete (Gnd)	J1-33	Input	GND_DISC_11	Gnd = Below DH
				<not> Gnd = Above DH
CONFIGURATION DATA			Description	Value
Out of Track Maximum		Pseudo altitude is only allowed to operate within		2800
Out of Track Minimum		these limits.		-20
Pseudo Altitude Type		Selects parameters for pseudo altitude engage logic		3
Field Enable Type		Selects pseudo altitude field elevation		2

CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C SHEET 233