Dual Couple Approach Mode - Honeywell SPZ-8000 Maintenance Manual

Digital automatic flight control system for gulfstream iv

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The summation of glideslope deviation and vertical deviation

rate is then TAS gain programmed. TAS gain programming allows

for better glideslope tracking qualities over a given range of

approach speeds. After being TAS gain programmed, the

glideslope command signal is routed to Figure 260, sheet 7 and

is processed as discussed in paragraph 3.B.(8)(i).

(h) Dual Couple Approach Mode

During the tracking phase of an ILS approach, the system will

utilize landing aid flightpath information from both the pilot

and copilot PFD.

Initiation of this flight segment of the

approach phase is automatic and occurs at 1200 feet radio

altitude as shown in Figure 259.1.

The dual couple mode requires all the following conditions to

be satisfied:

Pilot PFD NAV source must be NAV 1 or ILS 1.

Copilot PFD NAV source must be NAV 2 or ILS 2.

. Radio altitude less than 1200 feet.

. Both NAV 1 and NAV 2 sources are valid.

RADIOALTITUDE

~p%4Ri%:fiD"FEET

4.O-7.OMILES

Dual Couple Approach

Figure 259-.1

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