Appendix C
APPENDIX C Example (14 CFR part 25) The installation of a manually wound 24 hour military clock in the passenger cabin, and the clock is purchased from an unapproved distributor.
Requirements: As the clock is fully mechanical and not required, the applicable regulations include, but are not limited to the following:
1. 14 CFR § 21.125(b)(1) and (2): The GFE/SME design will have to be defined in the type design, including acceptance inspections and tests that would likely be required to comply with 14 CFR § 21.125(b)(1)&(2). The inspections and tests for the type design to comply with 14 CFR § 21.125(b)(1)&(2) should be developed to the extent necessary to establish that the compliance findings with respect to 14 CFR §§ 25.561(b), 25.789, 25.853, 25.1301 and 25.1309 are still valid from part to part.
2. 14 CFR § 21.53: Conformity would be normal, i.e., per type design. See paragraph above.
3. 14 CFR §§ 25.561(b), 25.789 and 25.853: Typical certification compliance effort for an item of mass in the cabin. Structural tests and burn tests may be required for certification.
4. 14 CFR § 25.1301: The accuracy and the environmental envelope that the clock is to operate can be specified by the modifier or by an agreement between the modifier and aircraft purchaser
(i.e., whether it needs a second hand, accurate to 1, 0.1 or .01 seconds etc., or needs to meet a military specifications, environmental operating conditions, color, size, etc.). The military or manufacturer’s specifications for the clock may provide adequate information.
5. 14 CFR § 25.1309(a): Defining the performance and qualification standards for this installation relative to 14 CFR § 25.1301 are up to the modifier, and the certification assessment is at the discretion of the FAA. The complian ce effort may be a spot check for functioning by the FAA.
6. 14 CFR §§ 25.671, 25.672, 25.901(c), 25.903(b) 25.1309, 25.1431(a): The clock’s failure does not affect the flight crew or other required equipment. Therefore, there is no FAA reliability requirement other than at the time of certification review “they perform their intended functions” under 14 CFR § 25.1309(a). Defining th e qualification standards for reliability for this installation is up to the modifier and the certification assessment is at the discretion of the FAA. The compliance assessment may be delegated or left to statements from the modifier or the clocks manufacturer, if necessary. The military or manufacturer’s specifications for the clock may provide adequate information.
Note: The above list of regulations is not all-inclusive. For instance, the affect of the weight of the installation would need to be assessed under the performance and structural regulations.
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