21. Maintenance and Continued Airworthiness Guidance.
a. Mai ntenance Instructions. TC/STC/ATC/ASTC applicant should specify instructions for handling, storing, shipping, and installing hardware elements in the IMA system. During the approval process of IMA systems, the applicant must address the requirements of 14 CFR 21.50(b) for Instructions for Continued Airworthiness.
b. Mai ntenance Diagnostics. See paragraph 14d of this AC.
c. Master Minimum Equipment List (MMEL). The applicant should develop a proposed MMEL with appropriate justification during the TC/STC/ATC/ASTC effort.
Procedures for safely dispatching the aircraft using the MMEL should be developed. Any MMEL allowance should be determined with consideration given to the criticality of the IMA functionality. MMEL allowances should be substantiated based on the aircraft-level functional hazard assessment. The proposed MMEL, justification, and procedures should be submitted to the Flight Operations Evaluation Board Chairman in the Aircraft Evaluation Group for FAA evaluation and approval. If modifications are made to the IMA system, the following guidance should be considered regarding the MMEL:
(1) The MMEL may need to be revised to address the IMA system hardware or software changes. Once the MMEL addresses the IMA equipment changes, it may be submitted to the FAA for approval.
(2) The FAA approving office (for example, Flight Standards District Office) should coordinate with ACO engineering when evaluating the revised MMEL.
Susan J.M. Cabler Assistant Manager, Aircraft Engineering Division, Aircraft Certification Service Page 43
Appendix 1
APPENDIX 1. Partial List of Functional TSOs.
The following is a partial list of the FAA TSOs that might be considered as functional TSOs in IMA systems. Note that applicants may apply for a TSO that does not adequately address all of the functionality in the system. Alternatively, applicants may apply for multiple TSOs, since no single TSO applies to all functions. If the applicant applies for multiple TSOs for a single system, that combination of TSOs may result in the system being considered complex or integrated, even though the individual TSOs were not.
TSO NUMBER SUBJECT TITLE TSO-C2d 6/14/89 Airspeed Instruments (using electronic sensing) TSO-C4c 4/1/89 Bank and Pitch Instruments TSO-C9c 9/15/60 Automatic Pilots TSO-C10b 9/1/59 Altimeter, Pressure Actuated, Sensitive Type TSO-C52b 5/30/95 Flight Director Equipment TSO-C92c 3/19/96 Airborne Ground Proximity Warning Equipment TSO-C93 11/26/76 Airborne Interim Standard Microwave Landing System (MLS) Converter Equipment TSO-C101 2/19/87 Over Speed Warning Instruments TSO-C104 6/22/82 MLS Airborne Receiving Equipment TSO-C105 6/13/84 Optional Display Equipment for Weather and Ground Mapping Radar Indicators TSO-C106 1/15/88 Air Data Computer TSO-C110a 10/26/88 Airborne Passive Thunderstorm Detection Equipment TSO-C115b 9/30/94 Airborne Area Navigation Equipment Using Multi-Sensor Inputs TSO-C117a 8/1/96 Airborne Windshear Warning and Escape Guidance Systems for Transport Airplanes TSO-C118 8/5/88 Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment, TCAS I TSO-C119a 4/9/90 Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment, TCAS II TSO-C123 8/2/96 Cockpit Voice Recorder Systems TSO-C129a 2/20/96 Airborne Supplemental Navigation Equipment Using Global Positioning System (GPS) TSO-C146 10/6/99 Stand-Alone Airborne Navigation Equipment Using The Global Positioning System (GPS) Augmented By The Wide Area Augmentation System (WAAS) TSO-C147 4/6/98 Traffic Advisory System (TAS) Airborne Equipment TSO-C151b 12/17/02 Terrain Awareness and Warning System TSO-C153 5/6/02 Integrated Modular Avionics Hardware Elements
NOTE: The revisions of TSOs may change. This list is only for reference purposes. Applicants should ensure that they are using the appropriate TSO revision.