829
Federal Aviation Administration, DOT
Pt. 91, App. A
ground return signals within the designed
range of operating altitudes.
(d)
Other instruments and equipment. All
other instruments and items of equipment
required by § 2 of this appendix must be capa-
ble of performing as necessary for Category
II operations. Approval is also required after
each subsequent alteration to these instru-
ments and items of equipment.
(e)
Evaluation program—(1) Application. Ap-
proval by evaluation is requested as a part of
the application for approval of the Category
II manual.
(2)
Demonstrations. Unless otherwise au-
thorized by the Administrator, the evalua-
tion program for each aircraft requires the
demonstrations specified in this paragraph.
At least 50 ILS approaches must be flown
with at least five approaches on each of
three different ILS facilities and no more
than one half of the total approaches on any
one ILS facility. All approaches shall be
flown under simulated instrument conditions
to a 100-foot decision height and 90 percent of
the total approaches made must be success-
ful. A successful approach is one in which—
(i) At the 100-foot decision height, the indi-
cated airspeed and heading are satisfactory
for a normal flare and landing (speed must be
plus or minus 5 knots of programmed air-
speed, but may not be less than computed
threshold speed if autothrottles are used);
(ii) The aircraft at the 100-foot decision
height, is positioned so that the cockpit is
within, and tracking so as to remain within,
the lateral confines of the runway extended;
(iii) Deviation from glide slope after leav-
ing the outer marker does not exceed 50 per-
cent of full-scale deflection as displayed on
the ILS indicator;
(iv) No unusual roughness or excessive at-
titude changes occur after leaving the mid-
dle marker; and
(v) In the case of an aircraft equipped with
an approach coupler, the aircraft is suffi-
ciently in trim when the approach coupler is
disconnected at the decision height to allow
for the continuation of a normal approach
and landing.
(3)
Records. During the evaluation program
the following information must be main-
tained by the applicant for the aircraft with
respect to each approach and made available
to the Adninistrator upon request:
(i) Each deficiency in airborne instruments
and equipment that prevented the initiation
of an approach.
(ii) The reasons for discontinuing an ap-
proach, including the altitude above the run-
way at which it was discontinued.
(iii) Speed control at the 100-foot decision
height if auto throttles are used.
(iv) Trim condition of the aircraft upon
disconnecting the auto coupler with respect
to continuation to flare and landing.
(v) Position of the aircraft at the middle
marker and at the decision height indicated
both on a diagram of the basic ILS display
and a diagram of the runway extended to the
middle marker. Estimated touchdown point
must be indicated on the runway diagram.
(vi) Compatibility of flight director with
the auto coupler, if applicable.
(vii) Quality of overall system perform-
ance.
(4)
Evaluation. A final evaluation of the
flight control guidance system is made upon
successful completion of the demonstrations.
If no hazardous tendencies have been dis-
played or are otherwise known to exist, the
system is approved as installed.
4. Maintenance program
(a) Each maintenance program must con-
tain the following:
(1) A list of each instrument and item of
equipment specified in § 2 of this appendix
that is installed in the aircraft and approved
for Category II operations, including the
make and model of those specified in § 2(a).
(2) A schedule that provides for the per-
formance of inspections under subparagraph
(5) of this paragraph within 3 calendar
months after the date of the previous inspec-
tion. The inspection must be performed by a
person authorized by part 43 of this chapter,
except that each alternate inspection may be
replaced by a functional flight check. This
functional flight check must be performed
by a pilot holding a Category II pilot author-
ization for the type aircraft checked.
(3) A schedule that provides for the per-
formance of bench checks for each listed in-
strument and item of equipment that is spec-
ified in section 2(a) within 12 calendar
months after the date of the previous bench
check.
(4) A schedule that provides for the per-
formance of a test and inspection of each
static pressure system in accordance with
appendix E to part 43 of this chapter within
12 calendar months after the date of the pre-
vious test and inspection.
(5) The procedures for the performance of
the periodic inspections and functional flight
checks to determine the ability of each list-
ed instrument and item of equipment speci-
fied in section 2(a) of this appendix to per-
form as approved for Category II operations
including a procedure for recording func-
tional flight checks.
(6) A procedure for assuring that the pilot
is informed of all defects in listed instru-
ments and items of equipment.
(7) A procedure for assuring that the condi-
tion of each listed instrument and item of
equipment upon which maintenance is per-
formed is at least equal to its Category II ap-
proval condition before it is returned to serv-
ice for Category II operations.
(8) A procedure for an entry in the mainte-
nance records required by § 43.9 of this chap-
ter that shows the date, airport, and reasons
for each discontinued Category II operation
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