4. c. (6) (c) ~ The autothrottle is disengaged by:
● Moving either power lever mounted A/T ENG/DISENG switch
● Pressing either power lever mounted A/T disconnect switch
● Manually moving the power levers
. Pressing A/T ARM button on the GP-820 Flight Guidance
Controller
. Selecting the cross-side A/T via the DC
. Deselecting the EPR limit rating on the DC
● Loss of EPR rating
. LP (Nl) split of 20 percent
. Engine out (N2 < 41 percent)
. Loss of engine data
.
A/T Fail
● FGC 1 and 2 Fail
G DADC 1 or DADC 2
. DClorDC2
. IRS 1 or IRS 2
● OAT< -70 “C (-80 “C for -910 PZ)
● Bleed air isolation valve open
. Speed target invalid (speed hold mode only)
● An autothrottle limit mode will drop the current
autothrottle mode but will not disconnect the
autothrottles.
(d) Manual Override
If during autothrottle operation the pilot manually moves
either of the power levers,
the A/T autothrottle will disengage
and momentarily annunciate OVRD on the PFD in green.
22-14-00
Page 298.197/298.198
Apr 15/93
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