"T-5 TEE BAR ASSEMBLY USED ON LOW-IMPACT RESISTANCE STRUCTURES FOR LIGHTING SUPPORTS FOR AIRPORT APPROACHLIGHTING SYSTEMS,MODELS ALSF-2 AND MALSR. PULTRUDED TUBE 1-3/4 INCH SQ BY13 FT 11 IN. LONG. PER FAA SPEC.FAA-E-2702;ITEM 1, DRWG D-6155-1, ALSF-2 AND MALSR LIR STRUCTURES, STRUCTURAL CONFIGURATIONS"