421-4 is cataloged as HOSE,NONMETALLIC. It carries 2 NSN identities and cross-references to 9 related part numbers. FAA PMA approval is on file from Adams Rite Aerospace Inc. An estimated 54 aircraft of the approved type are registered in the US. The part appears on MCRL cross-reference data.
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1-4 421, 100R1 TYAT SZ4, 129075, 40RB, 421-4(245-4), 51 R1T-1/4, 79505, SAE-J517, SAE-J517-53-4
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