COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes
AD/AC/66
Amdt 8
Wing Fatigue Life Limitation 13/89
Applicability: As specified in the Requirement.
Requirement: Retire wing main spar lower cap assembly from service (or modify in accordance with a scheme approved by the Authority) in accordance with the schedule below:
AIRCRAFT MODELS AFFECTED
(The straps referred to are wing spar lower cap fatigue life improvement reinforcements)
SPAR CAP RETIREMENT LIFE
(Hours’ Time in Service)
| MTOW of 6750 lb. | MTOW of 7400 lb. | ||
500B | 30400 | - | ||
500B used in low level survey type operations | 19900 | - | ||
500U with external strap (Pre S/N 1731) | 23200 | 17700 | ||
500U with external strap (Pre S/N 1731) and used in low level survey type operations | 15900 | 12100 | ||
560F | 24100 |
| ||
560F used in low level survey type operations | 16300 |
| ||
| MTOW of 8000 lb. | MTOW of 8500 lb. | ||
680F | 17100 | - | ||
680FL with external strap (Pre S/N 1731) | 17100 | 11200 | ||
680FL with internal strap (S/N 1731 and on) | 3900 | 30000 | ||
680FL (P) with external strap (Pre S/N 1731) | - | 25200 | ||
680T |
| 27100 |
| |
680V, 680W (Pre S/N 1731) with external strap |
| 23500 |
| |
685 |
| 20700 |
| |
690, 690A |
| 12900 |
| |
690B |
| 11500 |
| |
690C, 695 - canted aerodynamic wing tips |
| 11300 |
| |
690C, 695 - plain tips for total operational life |
| 24800 |
| |
695A |
| To be Advised. |
| |
Note 1: If Models 680F(P) or 680FL(P) aircraft are flown predominantly at low or zero cabin differential pressure, then the retirement life of Models 680F or 680FL respectively, shall apply.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Note 2: Should models other than the 500B, 500U and 560F be used in low level survey type operations, the Authority must be advised as a reduction in life will be necessary. For all aircraft engaged in low level operations appropriate log book entries must be made listing times actually engaged in such operations. The Authority must also be advised of any aircraft operating consistently at a flight duration of less than 45 minutes when averaged over the life of the aircraft.
Note 3: The wing spar lower cap assembly subject to retirement consists of the spar cap “T” section element together with the nesting angles, outer wing spar cap splice angles and, as fitted, either internal or external reinforcement straps. The outer wing spar caps need not be retired.
Note 4: On the basis of currently available fatigue substantiating data only one spar cap assembly replacement is permitted without further evaluation. This will normally allow only a single life extension from spar cap replacement or reinforcement/modification.
Note 5: Models not listed in the schedule generally have fatigue lives greater than 30000 hours and are thus unlikely to be affected.
Compliance: As specified in the Requirement.
Background: The retirement lives of this Directive are based directly on data provided by the manufacturer. Amendment 7 was raised to clarify the strap configuration for those models which were fitted with any one of a number of strap configurations during their production life. For all models, the internal straps were fitted to S/N 1731 and subsequent. Amendment 8 corrects some typographical errors.