X0101 EFFECT 33 LIVE 2006-10-03

S-4

0000003982 Allis Chalmers Energy Inc. 333-136978 0001373578 Allis-Chalmers GP, LLC 333-136978-12 0001373611 Allis-Chalmers LP, LLC 333-136978-11 0001373580 Allis-Chalmers Management, LP 333-136978-10 0001373577 Allis-Chalmers Production Services, Inc. 333-136978-09 0001373576 Allis-Chalmers Rental Tools, Inc. 333-136978-08 0001373575 Allis-Chalmers Tubular Services, Inc. 333-136978-07 0001373574 AirComp L.L.C. 333-136978-06 0001373573 Mountain Compressed Air, Inc. 333-136978-05 0001373572 OilQuip Rentals, Inc. 333-136978-04 0001373579 Rogers Oil Tool Services, Inc. 333-136978-03 0001023751 STRATA DIRECTIONAL TECHNOLOGY, INC. 333-136978-02 0000875495 TARGET ENERGY, INC. 333-136978-01