21-31 is cataloged as PUMP,DETECTOR KIT. It carries 1 NSN identity and cross-references to 11 related part numbers. FAA PMA approval is on file from Bogert Aviation, Bogert International. An estimated 1657 aircraft of the approved type are registered in the US. The part appears on MCRL cross-reference data. Federal purchase history shows 1 award totaling $94772.
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