GM No 1 to 21.A.112B Demonstration of capability for supplemental type-certificate (STC) cases
CAA ORS9 Decision No. 1
See also AMC 21.A.14(b) for the details of the alternative procedures.
The following examples of major changes to type design (ref: 21.A.91) are classified in two groups. Group 1 contains cases where a design organisation approved under Part 21 Subpart J (‘Subpart J DOA’) should be required, and Group 2 cases where the alternative procedure may be accepted. They are typical examples but each STC case should be addressed on its merits and there would be exceptions in practice. This classification is valid for new STCs, not for evolution of STCs, and may depend upon the nature of the STC (complete design or installation).
|
Product |
Discipline |
Kind of STC |
Group |
|---|---|---|---|
| All aircraft | |||
| OSD | |||
| Major stand-alone change to any OSD constituent | 1 | ||
| CS-23 (products where J DOA is required for TC) | |||
| Notes: STC which leads to reassess the loads on large parts of primary structure should be in group 1. 2/1 means that an assessment of consequences in terms of handling qualities, performance or complexity of demonstration of compliance may lead to classification in group 1. | |||
| Aircraft | |||
| Conversion to tail wheel configuration | 1 | ||
| Auxiliary fuel tank installations | 2/1 | ||
| Glass fibre wing tips | 2/1 | ||
| Fairings: nacelle, landing gear | 2 | ||
| Gap seals: aileron, flap, empenage, doors | 2 | ||
| Vortex generators | 2/1 | ||
| Spoiler installation | 1 | ||
| Increase in MTOW | 1 | ||
| Structures | |||
| Stretcher installation | 2 | ||
| Change to seating configuration | 2 | ||
| Windshield replacement (heated, single piece, etc.) | 2 | ||
| Light weight floor panels | 2 | ||
| Ski installations | 2/1 | ||
| Propulsion | |||
| Engine model change | 1 | ||
| Fixed pitch propeller installation | 2 | ||
| Constant speed propeller installation | 2/1 | ||
| Installation of exhaust silencer | 2 | ||
| Installation of Graphic engine monitor | 2 | ||
| Installation of fuel flow meter | 2 | ||
| Accessory replacement (alternator, magnetos, etc.) | 2 | ||
|
|
Inlet modifications: oil cooler; induction air |
2 |
|
|
|
Equipment |
|
|
|
|
Avionics upgrades (EFIS, GPS, etc.) |
02-Jan |
|
|
|
Engine instrument replacements |
2 |
|
|
|
Carburettor ice detection system |
2 |
|
|
|
Autopilot system installation |
1 |
|
|
|
Wing tip landing light; recognition lights |
2 |
|
|
|
WX radar installation |
2 |
|
|
|
Aeromedical system installations |
2 |
|
|
|
De- and anti-ice system installations |
1 |
|
|
|
Emergency power supply installations |
2 |
|
|
CS-25 |
|
||
|
|
Cabin Safety |
|
|
|
Note: Basically all changes related to cabin configuration should be in Group 2. |
Cabin layout (installation of seats (16G), galleys, single class or business / economy class, etc.) |
2 |
|
|
|
Floor path marking |
2 |
|
|
|
Crew rest compartment |
1 |
|
|
|
Change of cargo compartment classification (from class D to class C) |
1 |
|
|
|
Structure |
|
|
|
Note: STC which leads to reassess the loads on large parts of primary structure should be in Group 1. |
Cargo door |
1 |
|
|
|
Change from Passenger to Freighter configuration |
1 |
|
|
|
Avionics |
|
|
|
Notes: For CS-25 products, the existence of UKTSO is not taken into account for the classification; Impact on aircraft performance, and influence of aircraft performance are criteria to assess the classification ; Subjective assessment of human factors is considered for determination of classification. |
CVR |
2 |
|
|
|
VHF |
2 |
|
|
|
NAV (ADF, VOR, GPS, BRNAV) |
2 |
|
|
|
Autopilot, HUD, EFIS, FMS |
1 |
|
|
|
DFDR |
02-Jan |
|
|
|
Meteo radar |
2 |
|
|
|
ILS Cat 3 |
1 |
|
|
|
RVSM |
1 |
|
|
|
TCAS, EGPWS |
1 |
|
|
|
GPWS |
2 |
|
|
|
Powerplant |
|
|
|
Auxiliary fuel tanks |
1 |
||
|
Thrust Reverser system |
1 |
||
|
Hushkit |
1 |
||
|
Fire detection |
1 |
||
|
Fuel gauging |
1 |
||
|
Change of Engine or Propeller |
1 |
||
|
CS-27 or 29 |
All disciplines |
|
|
|
Note: 2/1 means that an assessment of consequences in terms of handling qualities and performance may lead to classification in Group 1. |
Main rotor or tail rotor blades replacement |
1 |
|
|
Autopilot |
1 |
||
|
Engine type change |
1 |
||
|
GPS installation |
2 |
||
|
Jettisonable overhead raft installation |
2 |
||
|
Utility basket installation |
2/1 |
||
|
Nose or side mount camera installation |
2/1 |
||
|
Passenger access step installation |
2/1 |
||
|
Protection net & handle installation (parachuting) |
2 |
||
|
VIP cabin layout |
2 |
||
|
Navigation system installation |
2 |
||
|
Fuel boost pump automatic switch-on installation |
2 |
||
|
Decrease of maximum seating capacity |
2 |
||
|
Agricultural spray kit installation |
2/1 |
||
|
Long exhaust pipe installation |
2 |
||
|
Flotation gear installation |
2/1 |
||
|
Wipers installation |
2 |
||
|
Engine oil filter installation |
2 |
||
|
Skid gear covering installation |
2/1 |
||
|
Gutter installation (top pilot door) |
2 |
||
|
Cable cutter installation |
2 |
||
|
Auxiliary fuel tank fixed parts installation |
2 |
||
|
Cabin doors windows replacement |
2 |
||
|
Radio-altimeter aural warning installation |
2 |
||
|
Stand-by horizon autonomous power supply |
2 |
||
|
Fire attack system |
2/1 |
||
|
Hoisting system installation |
2/1 |
||
|
External loads hook installation |
2 |
||
|
Emergency flotation gear installation |
2/1 |
||
|
Heating/demisting (P2 supply) |
2 |
||