AD 87-21-07 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 500 | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-A | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-B | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-S | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-U | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-E | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-F | Airworthiness Directives; Gulfstream Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), 720, 500S, 680FL, 685 and 700 Series Airplanes |
Unsafe Condition
Misfueling of the airplane resulting in engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify all fuel filler opening(s) in accordance with Gulfstream Service Information No. SI-209A, dated June 7, 1988. An equivalent means of compliance may be used if approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 12 calendar months after the effective date of this revised AD
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Affected Aircraft
Gulfstream Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), and 720 (S/N 1 through 1854); Models 500S (S/N 1755 through 3323), 680FL (S/N 1261 through 1853), 685 (S/N 12001 through 12066), and 700 (S/N 70001 through 70032) equipped with reciprocating engines.
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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