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out). The approach may be continued in Mode II or
Mode III. If the flightpath error increases to the point
where a large maneuver is required to bring the aircraft
back on course, the controller will send a waveoff message
that is displayed on the HUD and VDI and turns on
the WAVEOFF advisory. This discrete also disconnects
the autopilot (if engaged) and the AFCS reverts to stability
augmentation. The controller then transfers the
guidance of the aircraft to the bolter/waveoff controller,
who directs the pilot back into the landing sequences.
If the information stored in the data link is not updatedw
ithin any 2-secondp eriod during the descent,t he
TLT advisory goes on (missed message) and the AFCS
automatically disconnects and reverts to STAB AUG.
The pilot can continue the descent in Mode II or Mode
III.
At 12.5 seconds from touchdown (approximately
2,200 feet from the touchdown point), the 10 SECOND
advisory goes on, indicating deck motion data are being
added to the glidepath commands. This information is
in the form of a slight increase( or decreasei)n aircraft
altitude to adjust for the movement of the touchdown
ORIGINAL 17-12
NAVAIR Ol-FlhAD-1
point caused by the ship’s motion (roll, pitch, and
heave). Between 12.5 and 1.5 seconds tirn touchdown,
the CATCC sends an automatic waveoff if any part of
the carrier-based equipment fails and up to S seconds
tbrm touchdown if the aircraft exceeds the AN6PN-42
flightpath control envelope. Waveoff signals also may
be issued by the final controller (between lock-on and
touchdown) and the landing signal offtcer between 1
mile and touchdown. Approaches must be waved off at
weather minimums (200-feet altitude and In-mile visibility)
if the pilot cannot see the meatball.
At 2 seconds t?om touchdown, the landing system
freezes the pitch and bank commands and the AFCS
holds the aircraft’s attitude to touchdown unless the pilot
elects to override the AFCS either by maneuvering the
control stick or by manually disengaging the AFCS and
assuming control. If the aircraft bolters or if the pilot
decidest o go around,t he AFCS is disengageda utomatically
by means of overriding the control stick, and the
pilot enters the bolter/waveoff pattern.
Use of paddle switch to disengage AFCS for
Mode IA landing is not recommended since
DLC, pitch SAS, and roll SAS will also be
disengaged.
17.4.4.2 Mode II Landing Sequence. The early
phases of a Mode II descent (Figure 17-5) are identical
to a Mode I descents equence.T he aircraft to be recovered
is directed through the marshaling area, received
LANDING CHK, and arrives at the ACLS radar acquisition
gate. When the lock-on discrete (ACL READY)
messageis received,t he pilot continuest o fly the aircraft
manually (using APC as desired) in response to VDI
and/or HUD displays.
Ifthere is an equipment failure, the system (CATCC)
will send a voice discrete signal that turns on the VOICE
advisory, and the ANKPN-42 error information displayed
will be invalid and thus removed. The pilot then
expects to receive standard voice commands and will
probably use the redundant ILS information or switch
to tacan steering.
As long ast he aimrat?is locatedw ithin the AN/SPN42
flightpath control envelope for Mode II, the descent is
continued until visual contact is made with the Fresnel
lens optical landing system meatball. All waveoffs in
Mode II are given by the final controller of the LSO.
Approaches are terminated at weather minimums (200-
feet altitude and l/2-mile visibility) if the pilot cannot
see the meatball.
At any time before 12.5s econdsfr om touchdown,the
pilot can switch from a Mode II manual to a Mode I
automatic flightpath control, provided the coupler available
discrete is being received and the ACL interlock is
true.
17.4.4.3 Mode Ill Landing Sequence. Mode III
descents follow the same general sequence as that of
Modes I and II, but Mode III approachesa re talkdown
landings; that is, all flightpath corrections are provided
by voice and no computerized discrete signals are sent.
The use ofAPC is optional. Approaches are terminated
at the weather minimums ifthe FLOLS (meatball) is not
visible to the pilot for continuing the landing.
17-13 ORIGINAL
PLATFORM 5.000 FEET
“GLINFIGHTER 401”
“PL*TF*RW
STEER COMMAND - AWL DE”IATvJN SYMBOLS ON
H”DNDI,. FOR EXAMPLE.
“GUNF,O”TER 401 FLY UP.
~-MILE DME FIX 1,200 FEET FLY RIGHT-.
APC ENOAOED IIF DESIREDI
DLC ENGAGED
　
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