AD 75-08-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sabreliner Corporation | NA-265 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-20 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-30 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-40 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-60 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-70 | Airworthiness Directives; ROCKWELL INTERNATIONAL Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA- 265-40, NA-265-60 and NA-265-70 Airplanes |
Unsafe Condition
Loss of electrical power in flight due to loose cable lugs, cracked circuit breaker cases, or insufficient torque on cable lugs attached to Essential Bus circuit breakers.
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Required Actions
Inspect and replace loose or cracked Essential Bus circuit breakers and cable terminals, adjust torque to 50-60 inch-pounds. Revise AFM Limitations Section and install specified placards. Test or replace circuit breakers per Service Bulletin 74-28. Comply with Service Bulletin 11 for cooling improvements and circuit breaker replacements. Remove specific placards after installing new ones as per later amendments.
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Compliance Time
Within the next 50 hours time in service or 30 days, whichever is sooner, after April 14, 1975 for paragraphs (a) through (f). Paragraphs (g) through (i) have specific dates: (g) after August 5, 1976; (h) before September 1, 1976; (i) before October 15, 1976 and April 25, 1977.
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Affected Aircraft
Rockwell International Models NA-265, T-39A, NA-265-20, T-39B, NA-265-30, T-39D, NA-265-40, NA-265-60, and NA-265-70 Airplanes, including specific serial ranges for NA-265-40 (282-98 to 282-137) and NA-265-60 (306-64 to 306-93).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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