Honeywell MK VI - Manual (Page 109)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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Short-term current limit protection is provided on all drivers for output shorting conditions. Ground going output
discretes may be connected together to produce a ‘wired OR’ function for the active low state of the outputs. If
output discretes are ‘wire OR’d’ then diodes must be installed for isolation. Output discretes are intended to
operate with +28 VDC lamp sources and will not operate with +5 VDC lamp sources.
3.15.2.1 Lamp Form at
The Lamp Format Type (configuration) is a function of the discrete output pin functions and defines the
operation of the red and amber GPWS cockpit lamps.
For Lamp Format Type 1, the amber “Below G/S” lamp is driven by the GPWS Alert (Glideslope only) discrete
and the red “GPWS” lamp is driven by the remaining alerts and warnings.
For Lamp Format Type 2, the red “GPWS” lamp is driven by the GPWS Warning (Pull Up, Terrain Pull Up, and
Obstacle Pull Up only) discrete and the amber “GPWS” lamp is driven by the remaining alerts and warnings.
Note: Lamp Format 2 is highly recommended by Honeywell. As of April 2002 the FAA position paper
on Lamp Format is in draft form, the FAA may require that all new installation of EGPWS use
Lamp Format 2.
3.15.2.2 Flashing La mps
The Flashing Lamps option is configurable as a function of the discrete output pin functions and defines the
operation of the red and amber GPWS cockpit lamps. If the Flashing Lamps option is selected, both the red and
amber GPWS cockpit lamps will flash when they are illuminated, if Flashing Lamps is not selected, they will be
illuminated as steady lights.
3.15.2.3 GPWS INOP Discrete
The GPWS INOP discrete (J1-72) indicates GPWS modes are inoperative. This feature activates a ‘GPWS
INOP” lamp located in the cockpit within sight of the pilots.
3.15.2.4 TAD INOP D iscrete
The TAD INOP discrete (J1-55) indicates Terrain Clearance Floor (TCF), Terrain Awareness (TA), and Terrain
Display are ‘Not Available’. This feature activates a ‘TERRAIN NOT AVAILABLE” lamp located in the cockpit
within sight of the pilots.
3.15.2.5 GPWS War ning Discrete
(Lamp Format Type 1 definition)
GPWS Warning discrete (J1-78) will activate during any Mode 1 through Mode 4 alert or warning, Terrain
Awareness caution/warning, or Obstacle Awareness caution/warning. This feature activates a ‘GPWS’ lamp
located in the cockpit within sight of each pilot. Note that Mode 6 does not activate any lamp outputs, only
voices.