The FAA’s published airworthiness directives (AD) focused on the fuel quantity indication system for several different airframe platforms. The ADs were issued to prevent ignition sources inside the center fuel tank, which in combination with flammable fuel vapors, could result in a fuel tank explosion. The AerSafe system, which was originally designed to comply with the FAA mandate for Fuel Tank Flammability (FTFR), is an FAA certified Ignition Mitigation Means (IMM) under 14 CFR 25.981 (a)(c)(d).
The FAA’s published Fuel Tank Flammability Reduction Rule (FTFR) mandates that operators of transport category aircraft must take measures to mitigate the possibility of fuel tank vapor ignition in certain aircraft models. To avoid being grounded, all affected passenger aircraft flying within or into the United States under FAR Part 121 operations must be equipped with an FAA-approved fuel tank migration means to meet the FTFR mandate. Affected aircraft models include the Airbus 319, 320, 321, and 330 and Boeing 737, 757, 767, and 777.
(ref: FAA Advisory Circular 120-98A), OEMs offer nitrogen inerting systems for their aircraft; however, these systems are expensive to purchase with lead times ranging from 6-12 months and costly to maintain. AerSale recognized the opportunity to develop an engineered solution to comply with FTFR requirements, and we are proud of our engineers and technicians who have successfully brought AerSafe to market as a safe, reliable, and low-cost FTFR means of compliance. As the FTFR requirement has largely been complied with, AerSafe has a new calling - helping operators comply with the FQIS ADs.
AerSafe® is an EASA and FAA-approved method of compliance (MOC) to meet the requirements of 14 CFR 25.981 (c) and 121.1117. It is a fuel tank flammability reduction system developed by AerSale, and one of the few FAA approved ignition mitigation means currently available that complies with the Fuel Quantity Indication System (FQIS) AD and Fuel Tank Flammability Reduction (FTFR) rule. AerSafe exempts aircraft installed with an IMM solution from complying with the FQIS AD. The FTFR rule requires fuel tank ignition sources and flammability exposure to be reduced in fuel tanks that are most at risk.
The AerSafe system limits the amount of available oxygen within the empty space of the fuel tank where fuel vapors are present and prevents sparks or other ignition sources from initiating an explosion. It has been tested and developed to exact tolerances to fill the cavity of Boeing and Airbus center fuel tanks.
The foam system is comprised of multiple blocks of highly porous material which completely fill the aircraft center tank interior, with negligible voids. Precision hot wire cut individual reticulated polyurethane foam blocks are installed through the existing inspection/maintenance access panels in accordance with installation drawings. The system properties allow for free movement of fuel within the tank and into the fuel delivery system to the engines, whilst preventing gross over-pressure or explosion within the tank by limiting the extent of any vapor/air ignition to a small local detonation, preventing it propagating throughout the tank.
Our AerSafe customers have already saved millions by avoiding the purchase of expensive OEM inerting systems to meet current FQIS and FTFR requirements for their aircraft.
FAA AD 2016-07-07
This AD applies to The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes.
FAA AD 2019-23-04
This AD applies to The Boeing Company Model 727, 727-100, 727C, 727-100C, 727-200, and 727-200F series airplanes, equipped with Boeing body-mounted auxiliary fuel tanks.
FAA AD 2019-24-01
This AD applies to the Airbus SAS airplanes Model for which AerSafe was granted an Alternative Means of Compliance (AMOC)
FAA AD 2020-18-12
This AD applies to The Boeing Company Model 777-200, 777-200LR, and 777-300 series airplanes
FAA AD 2020-18-13
This AD applies to The Boeing Company Model 737-600, -700, -700C, -800, (-900, and -900ER currently in certification, expected late August 2023 certification)
FAA AD 2020-18-16
This AD applies to The Boeing Company Model 767-200, -300, -300F, and -400ER) series airplanes
Passenger aircraft operating under 14 CFR Parts 121, 125, and 129 that must meet the FQIS and FTFR rule. (see: FAA Advisory Circular 120-98A)