Downtime and Workscope
There are five aircraft models applicable to this modification. Each model has some differences in standard equipment and will be priced accordingly. Typical downtime for any of the models is dependent upon modification time required by Honeywell (AlliedSignal) to modify your engines. Currently, conversion time at Honeywell (AlliedSignal) is requiring approximately six to eight weeks for all models. If necessary, rental engines can be found for you to allow you to use the aircraft during the engine conversion process. The airframe modification requires approximately four weeks for the 690, 690A, and 690B aircraft. The models 690C and 690D take approximately one week to modify the airframe for the Dash 10 engines. Add seven working days after delivery of the modified engines to install, rig, and test fly the aircraft. While Honeywell (AlliedSignal) makes every effort to hold to the six week conversion time period, the time may be affected by number of engines in the conversion process or delays from their vendors.
Turbo Commander 690, 690A, AND 690B
These three models are quite similar when it comes to this modification. The biggest difference between these models and the later models is the necessity to modify the engine nacelles to accept the larger tailpipes and install electrically operated oil cooler doors. The larger tailpipes are necessary for the Dash 10 engines in order to have proper airflow through the engine for fuel economy and power at altitude.
PropJet Commander 690C and 690D
Installation of this modification on these aircraft is somewhat easier than the earlier models. The main difference is in the engine nacelles; these models do not require modification of that area. These aircraft may benefit from reduced downtime by using rental engines while your engines are being modified. Rental availability may be limited; call to schedule this option with the modification process as soon as possible to allow better availability of rental engines. Add $6,000.00 to price (plus engine rental fees, engine oil, fuel, and miscellaneous materials) for the additional removal and installation of the rental engines. In the 690D (900 Model) aircraft, there is one option available that will give you the ability go to 35,000 feet altitude for even greater fuel efficiency. This option is to install a new style Stall Warning System.