| AD Number | 49-23-01 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Boeing Airplane Company, Wichita Division |
| Model(s) | 75 (Army PT-13) A75 (Army PT-13A, -13B, -13C) A75J1 (Army PT-18) A75L3 A75L300 A75N1 (Army PT-17, -17A, Navy N2S-1, -4) B75 (Navy N2S-5) B75N1 (Navy N2S-3) D75N1 (Army PT-27) E75 (Army PT-13D, Navy N2S-5, PT-13D/N2S-5) E75N1 (Army PT-13D, Navy N2S-5, PT-13D/N2S-5) IB75A |
49-23-01 BOEING: Applies to All Model 75 Series Airplanes With Crop Dusting or Seeding Hopper Installations.
Compliance required prior to next periodic inspection.
Inspect to determine whether fuselage bottom truss was altered for installation of hopper throat. All alterations involving the removal or revision of the truss members require that equivalent structural strength be provided. One open bay in the bottom truss either immediately forward or immediately aft of the cross member (streamline tube) at Station 2L is permissible provided that it is limited to a rectangle bounded by the longerons, the above-mentioned cross member and a 7/8 x 0.035, or larger, x4130 tube parallel to the streamline tube and not more than 8 inches forward or aft thereof. The inside corners of this open rectangle should have 0.065-inch x 4130 gussets, or equivalent, extending along the longerons at least 2 inches.
(Boeing Report No. WD-10645 covers this same subject and includes an alternate alteration recommended as preferable to the above. Copies of the report are obtainable from the Boeing Airplane Co., Wichita Division, Wichita 1, Kansas.)
This supersedes AD 46-31-03.