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14 CFR Ch. I (1–1–24 Edition)
§ 121.705
(5) The nature of the failure, mal-
function, or defect.
(6) Identification of the part and sys-
tem involved, including available infor-
mation pertaining to type designation
of the major component and time since
overhaul.
(7) Apparent cause of the failure,
malfunction, or defect (e.g., wear,
crack, design deficiency, or personnel
error).
(8) Whether the part was repaired, re-
placed, sent to the manufacturer, or
other action taken.
(9) Whether the aircraft was ground-
ed.
(10) Other pertinent information nec-
essary for more complete identifica-
tion, determination of seriousness, or
corrective action.
(f) A certificate holder that is also
the holder of a Type Certificate (in-
cluding a Supplemental Type Certifi-
cate), a Parts Manufacturer Approval,
or a Technical Standard Order Author-
ization, or that is the licensee of a type
certificate holder, need not report a
failure, malfunction, or defect under
this section if the failure, malfunction,
or defect has been reported by it under
§ 21.3 of this chapter or under the acci-
dent reporting provisions of 49 CFR
part 830.
(g) No person may withhold a report
required by this section even though
all information required in this section
is not available.
(h) When certificate holder gets addi-
tional information, including informa-
tion from the manufacturer or other
agency, concerning a report required
by this section, it shall expeditiously
submit it as a supplement to the first
report and reference the date and place
of submission of the first report.
[Doc. No. 6258, 29 FR 19226, Dec. 31, 1964, as
amended by Doc. No. 8084, 32 FR 5770, Apr. 11,
1967; Amdt. 121–72, 35 FR 18188, Nov. 28, 1970;
Amdt. 121–143, 43 FR 22642, May 25, 1978;
Amdt. 121–178, 47 FR 13316, Mar. 29, 1982;
Amdt. 121–187, 50 FR 32375, Aug. 9, 1985;
Amdt. 121–195, 53 FR 8728, Mar. 16, 1988;
Amdt. 121–251, 60 FR 65936, Dec. 20, 1995;
Amdt. 121–319, 70 FR 76979, Dec. 29, 2005;
Amdt. 121–387, 87 FR 75846, Dec. 9, 2022]
§ 121.705 Mechanical interruption
summary report.
Each certificate holder shall submit
to the Administrator, before the end of
the 10th day of the following month, a
summary report for the previous
month of:
(a) Each interruption to a flight, un-
scheduled change of aircraft en route,
or unscheduled stop or diversion from a
route, caused by known or suspected
mechanical difficulties or malfunctions
that are not required to be reported
under § 121.703.
(b) The number of engines removed
prematurely because of malfunction,
failure or defect, listed by make and
model and the aircraft type in which it
was installed.
(c) The number of propeller
featherings in flight, listed by type of
propeller and engine and aircraft on
which it was installed. Propeller
featherings for training, demonstra-
tion, or flight check purposes need not
be reported.
[Doc. No. 6258, 29 FR 19226, Dec. 31, 1964, as
amended by Amdt. 121–10, 30 FR 10025, Aug.
12, 1965; Amdt. 121–319, 70 FR 76979, Dec. 29,
2005]
§ 121.707 Alteration and repair re-
ports.
(a) Each certificate holder shall,
promptly upon its completion, prepare
a report of each major alteration or
major repair of an airframe, aircraft
engine, propeller, or appliance of an
aircraft operated by it.
(b) The certificate holder shall sub-
mit a copy of each report of a major al-
teration to, and shall keep a copy of
each report of a major repair available
for inspection by, the representative of
the Administrator who is assigned to
it.
§ 121.709 Airworthiness release or air-
craft log entry.
(a) No certificate holder may operate
an aircraft after maintenance, preven-
tive maintenance or alterations are
performed on the aircraft unless the
certificate holder, or the person with
whom the certificate holder arranges
for the performance of the mainte-
nance, preventive maintenance, or al-
terations, prepares or causes to be pre-
pared—
(1) An airworthiness release; or
(2) An appropriate entry in the air-
craft log.
