AMC E 790 Rain and Hail Ingestion

(1)For the purposes of interpreting the words ‘unacceptable mechanical damage’ and ‘unacceptable power or thrust loss' in CS-E 790(a)(1), (a)(2), (b) and (c), see paragraphs (5)(c)(vi), (5)(c)(vi)(A) and (B) in AMC E 790(a)(2).

(2)For the purposes of interpreting the words ‘flameout, rundown, continued or non-recoverable surge or stall’ in CS-E 790(a)(2) and (b), see paragraphs (1) and (5)(c)(vi) in AMC E 790(a)(2).

(3)For the purposes of interpreting the words ‘sudden encounter’ in CS-E 790(a)(2) and the words ‘suddenly commencing’ in CS-E 790(b), see paragraphs (5)(c)(iv)(D) and (G) in AMC E 790(a)(2).

(4)For the purposes of interpreting the words ‘rapid acceleration’ and ‘rapid deceleration’ in CS-E 790(b)(2) and (b)(4) should be interpreted as meaning a throttle movement in not more than one second.

(5)If the Engine is certified under the assumption that the protection device considered under CS-E 790(d) is provided by the aircraft installation and if the compliance with CS-E 790(a) to (c) is waived, then the Engine approval would be endorsed accordingly and the Engine instructions for installation would need to impose the conditions of CS-E 790(d)(1) to (3) to the installation.

[Amdt No: E/1]