Part Number: 129-420031-29 (Doubler-fwd-lower-a/s door frame) Part Number: 129-420031-3 (Splice band-airstair door frame ) Part Number: 129-420031-31 (Doubler-aft-lower-a/s door frame) Part Number: 129-420031-35 (Stiffener-airstair door frame in) Part Number: 129-420031-37 (Splice-airstair door frame inst) Part Number: 129-420031-39 (Stringer-airstair door frame ins) Part Number: 129-420031-41 (Intercostal-aft-lower-a/s door f) Part Number: 129-420031-42 (Intercostal-aft-upper-a/s door f) Part Number: 129-420031-43 (Stiffener) Part Number: 129-420031-45 (Doubler-airstair door frame inst) Part Number: 129-420031-5 (Splice-airstair door frame inst) Part Number: 129-420031-7 (Intercostal-aft lower) Part Number: 129-420031-8 (Intercostal-aft lower) Part Number: 129-420031-9 (Intercostal-fwd-lower-a/s door f)