Engine Maintenance and Repairs

12.3 Engine Overhaul and Replacement.

1. 
   TBO Intervals. TBO intervals vary by engine model/series and Service – see each Annex.
   
2. 
   Quick Engine Change (QEC) / Replacement Engines. Following best commercial practices, QEC engines shall be shipped with the following items installed, which must also be returned on the engine:
   

(b) Fuel pump

(c) Fuel nozzle assembly and transfer tubes

(d) Temperature compensator

(e) Oil-to-fuel heat exchanger and transfer tube

(f) External oil scavenge pump

(g) Oil scavenges and pressure tubes

(h) Oil filler cap and dipstick

(i) Propeller reversing linkage (fwd & rear), and associated component

(j) Propeller interconnect linkage

(k) Propeller governor

(l) Propeller governor sense lines

(m) Ignition cable assembly (ignition exciter to spark igniter plugs)

(n) Compressor air bleed valve (left and right)

(o) Insulated and heated air pressure lines

(p) Torque Limiter

3. 
   Unscheduled Removal. The Contractor shall telephonically notify the PMA/PMO of the need for an engine and the circumstances surrounding the requirement. The Contractor shall support unscheduled repair removals and shall meet a maximum 3-day transportation replacement time limit per engine CONUS and 6 days OCONUS. The receipt of PMA/PMO authorization begins the required delivery schedule/calculation.
   

12.3.5 Repairs. Replacement engines for those requiring removal for repair shall have a minimum of 20% of TBO life remaining unless approved by the PMA/PMO.

12.3.6 Rentals. (See also Annex C service unique requirements). Due to the limited availability of spare engines, the Contractor shall utilize rental engines, when authorized by the PCO, in order to meet mission capability (MC) requirements. The Contractor shall ensure that rental engines provided are certified to meet the manufacturer's overhaul specifications and have all mandatory safety-of-flight bulletins incorporated at time of installation on the aircraft. Additionally, rental engines shall be maintained in a safe-for-flight condition while installed. Costs for maintaining the safe-for-flight condition will be included in the rental cost. When utilizing rental engines for replacement of engines requiring overhaul or repair, the time constraints, delivery schedules, and notification requirements outlined in Contract Section F apply. During all periods when rental engines are being used, the Contractor shall report engine rental usage each month IAW Report/CDRL A036; no CDRL need be submitted when no usage occurs.. The report shall identify the date of the Government rental authorization, as well as the engine shipping, receipt and install date by serial number, aircraft BuNo and site location. The Contractor shall also track and report the usage and costs by engine hours and rental days and report engine removal and return shipping dates.

12.3.6.1 Rental Engine Hot Section Inspections (HSI). Unless an HSI requirement is directly attributable to fleet operator misuse, the cost to perform the HSI, inclusive of materials, shall be covered in the rental cost.

12.3.6.2 Rental Engine Repair/Overhaul. Unless an engine repair or overhaul is directly attributable to fleet operator misuse, the cost to repair or overhaul a rental engine, inclusive of materials, shall be covered in the rental cost.

12.3.7 Catastrophic Circumstances. In the event of catastrophic circumstances requiring additional replacement engines, the Contractor shall identify all commercially available sources of serviceable PT6A-series replacement engine(s) that meet, or can be updated to meet, current configuration requirements. The Contractor shall conduct an evaluation to determine the most cost-effective replacement engine candidate(s), identifying selected and non-selected candidates by serial number, location and cost to bring each engine to current configuration. All supporting data, including justification of selection(s) shall be submitted to the PMA/PMO for review and approval by the PCO.