Text in force at 23-63: from 23-17, effective 1 Feb 1977.
[For reciprocating engine powered airplanes the following apply:]
(a) Each exhaust heat exchanger must be constructed and installed to withstand the vibration, inertia, and other loads that it may be subjected to in normal operation. In addition--
(1) Each exchanger must be suitable for continued operation at high temperatures and resistant to corrosion from exhaust gases;
(2) There must be means for inspection of critical parts of each exchanger; and
[(3) Each exchanger must have cooling provisions wherever it is subject to contact with exhaust gases.]
(b) Each heat exchanger used for heating ventilating air must be constructed so that exhaust gases may not enter the ventilating air. Notice of Invitation to Submit Proposals; Notice No. 74-5; Issued on 2/14/74. Notice of Compilation of Proposals; Notice No. 74-5A; Issued on 5/22/74. Notice of Availability of Agenda; Notice No. 74-5B; Issued on 10/3/74. Notice of Clarifying Revisions; Notice No. 74-33; Issued on 10/3/74. Notice of Conference; Notice No. 74-5C; Issued on 11/25/74. Notice of Availability of Conference Summary; Notice No. 74-5D; Issued on 2/4/75. Notice of Airworthiness Review Program No. 2; Notice No. 75-10; Issued on 2/27/75. Notice of Airworthiness Review Program No. 3; Notice No. 75-19; Issued on 5/13/75. Notice of Airworthiness Review Program No. 4; Notice No. 75-20; Issued on 5/13/75. Notice of Airworthiness Review Program No. 5; Notice No. 75-23; Issued on 5/19/75. Notice of Airworthiness Review Program No. 6; Notice No. 75-25; Issued on 5/29/75. Notice of Airworthiness Review Program No. 7; Notice No. 75-26; Issued on 6/9/75.
41 FR 55465 · Source