Airworthiness directives › 2012-11-09
AD 2012-11-09 Airworthiness Directives; Various Transport Category Airplanes
Applicability*9
This AD applies to transport category airplanes, in passenger-carrying operations, as specified in paragraph (c)(1) or (c)(2) of this AD. (1) Airplanes that complied with the requirements of AD 2011-04-09, Amendment 39-16630 (76 FR 12556, March 8, 2011). (2) Airplanes equipped with any chemical oxygen generator installed in any lavatory and are: (i) Operating under part 121 of the Federal Aviation Regulations (14 CFR part 121); or (ii) U.S. registered and operating under part 129 of the Federal Aviation Regulations (14 CFR part 129), with a maximum passenger capacity of 20 or greater.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
This paragraph restates the requirements of paragraph (g) of AD 2012-11-09, Amendment 39-17072 (77 FR 38000, June 26, 2012), with no changes. Within 21 days after March 14, 2011 (the effective date of AD 2011-04-09, Amendment 39-16630 (76 FR 12556, March 8, 2011)), do the actions specified in paragraphs (g)(1) and (g)(2) of this AD. (1) Activate all chemical oxygen generators in the lavatories until the generator oxygen supply is expended. An operator may also remove the oxygen generator(s), in accordance with existing maintenance practice, in lieu of activating it. (2) For each chemical oxygen generator, after the generator is expended (or removed), remove or re-stow the oxygen masks and close the mask dispenser door. Note 1 to paragraph (g) of this AD: Design approval holders are not expected to release service instructions for the actions specified in paragraph (g) of this AD.
Unsafe condition
This AD was prompted by the determination that the current design of chemical oxygen generators presents a hazard that could jeopardize flight safety and the discovery that certain existing requirements could impose an unnecessary burden on operators. We are issuing this AD to eliminate a hazard that could jeopardize flight safety, and to ensure that all lavatories have a supplemental oxygen supply.
Affected ADs
This AD revises AD 2012-11-09, Amendment 39-17072 (77 FR 38000, June 26, 2012).
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