IFR NAV-401L Operation & Maintenance Manual (1-09-0726) by IFR Sale $75.00 | / SKU 31037:R Printed Manual - $75.00 Download - $75.00 Printed Manual Download Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Marker, G/S, VOR, LOC, COMM, Ramp and Bench Test Set Serial No. Effectivity: 1636 and on November 1976