Airworthiness Directive · Amendment 39-21163 · Fuel storage
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737-8 and 737-9 airplanes with an airworthiness certificate or export certificate of airworthiness issued on or before the effective date of this AD, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-8 and 737-9 (737 MAX) airplanes. This AD requires removing Kathon FP 1.5 biocide from the fuel tanks and engines, installing a fuel limitation placard, and revising the existing airplane flight manual (AFM) to prohibit operation of the airplane with Kathon FP 1.5 biocide in a fuel tank or engine. This AD was prompted by a report indicating that Kathon FP 1.5 biocide added to fuel and running through the engines can lead to significant engine anomalies. The FAA is issuing this AD to address the unsafe condition on these products.
(1) For airplanes identified in paragraphs (g)(1)(i) and (ii) of this AD: Before further flight, remove Kathon FP 1.5 biocide from the fuel tanks and engines, as applicable, in accordance with Boeing Multi-Operator Message MOM-MOM-20-0522-01B, dated June 24, 2020.
(i) Airplanes that have operated for fewer than 30 flight cycles after the last treatment with Kathon FP 1.5 biocide.
(ii) Airplanes having any engine where that engine has operated for fewer than 30 flight cycles after the last exposure to Kathon FP 1.5 biocide.
(2) No action is required by paragraph (g) of this AD for the engines on which CFM confirmed via myCFM case response that the engines are operating as expected.
Before further flight, install a placard with letters having a minimum height of 0.20 inch on white or light gray background containing the text “DO NOT OPERATE ENGINE WITH KATHON TM FP 1.5 BIOCIDE FUEL ADDITIVE” on the interior area of the refuel access panel in a location that allows refueling personnel full view of the placard text when the access door is open.
Before further flight, revise the Certificate Limitations section of the existing airplane flight manual (AFM) to include the information specified in figure 1 to paragraph (i) of this AD. This may be done by inserting a copy of this AD into the existing AFM. When a statement identical to that in figure 1 to paragraph (i) of this AD has been included in the general revisions of the existing Boeing 737 AFM, the general revisions may be inserted into the existing AFM, and the copy of this AD may be removed from the existing AFM.
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.
Aircraft
