Airworthiness Directive · Amendment 39-22497 · Oxygen
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500, 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER, 757-200, 757-200PF, 757-200CB, 757-300, 767-200, 767-300, 767-300F, and 767-400ER series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500, 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER, 757- 200, 757-200PF, 757-200CB, 757-300, 767-200, 767-300, 767-300F, and 767-400ER series airplanes. This AD was prompted by reports indicating premature aging of certain passenger chemical oxygen generators. This AD requires repetitively replacing affected chemical oxygen generators with serviceable parts. This AD also limits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
Within 30 days after the effective date of this AD: Inspect passenger chemical oxygen generators having part numbers 117080-02, 117080-03, and 117080-04 to determine their date of manufacture. A review of airplane maintenance records is acceptable for the inspection, provided the date of manufacture can be conclusively determined by that review.
For purposes of this AD, a serviceable unit is a passenger chemical oxygen generator that meets the condition specified in either paragraph (h)(1) or (2) of this AD.
(1) Part numbers 117080-02, 117080-03, and 117080-04, with a manufacturing date not older than 10 years.
(2) Approved part numbers other than 117080-02, 117080-03, and 117080-04, provided the generator has not exceeded the life limit established for that generator by the manufacturer.
For any passenger chemical oxygen generators having part numbers 117080-02, 117080-03, and 117080-04: At the applicable time specified in paragraph (i)(1) through (4) of this AD, replace the chemical oxygen generator with a serviceable unit, as defined in this AD. Thereafter, replace chemical oxygen generators having part numbers 117080-02, 117080-03, and 117080-04 with serviceable units, as defined in this AD, before exceeding 10 years since date of manufacture.
Note 1 to paragraph (i): Additional guidance for replacing the affected passenger chemical oxygen generators can be found in Collins Aerospace Service Information Letter 117080-SIL-002, dated May 4, 2022, and approved maintenance procedures.
(1) After doing the inspection in paragraph (g) of this AD: If the passenger chemical oxygen generator has a date of manufacture in 2008 or earlier, replace before further flight or within 15 years since the date of manufacture, whichever occurs later.
(2) For passenger chemical oxygen generators that have a date of manufacture in 2009 or 2010: Replace within 12 months after the effective date of this AD.
(3) For passenger chemical oxygen generators that have a date of manufacture in 2011, 2012, or 2013: Replace within 24 months after the effective date of this AD.
(4) For passenger chemical oxygen generators that have a date of manufacture in 2014 or later: Replace before exceeding 10 years since the date of manufacture, or within 24 months after the effective date of this AD, whichever occurs later.
As of the effective date of this AD, no person may install a passenger chemical oxygen generator, unless the oxygen generator is a serviceable unit, as defined in this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
