of the inspection, the defects found, and the signature of the employee making the inspection. The report shall be approved by the foreman, with proper written explanation made thereon for defects reported which were not repaired before the locomotive is returned to service. The report shall then be filed in the office of the railroad company at the place where the inspection is made.** Form No. 2-A Locomotive Number___. _Railroad. LOCOMOTIVE INSPECTION REPORT Instructions: Each locomotive must be inspected after each trip or day's work and report made on this form whether needing repairs or not. Proper explanation must be made hereon for failure to repair any defect reported, and the form approved by foreman, before the locomotive is returned to service. Inspected at__ _time____M. Date___ _19_ Repairs needed: Condition of brakes_. Main reservoir pressure-- --pounds. Brake-pipe pressure__ ---pounds. The above work has been performed, except as noted, and the report is approved. NOTE: Additional items may be added to this report if desired. Foreman. 1 When locomotive consists of more than one unit, each unit number shall be given. BRAKE EQUIPMENT: AIR BRAKES 91.204 General precautions. It must be known before each trip that the brakes are in safe and suitable condition for service; that the air compressor or compressors are in condition to provide an ample supply of air for the service in which the locomotive is put; that the devices for regulating all pressures are properly performing their functions; that the brake valves work properly in all positions; and that the water has been drained from the air-brake system.*† 91.205 Main reservoir system-(a) Safety valve. The main reservoir system of each unit shall be equipped with at least one safety valve, the capacity of which shall be sufficient to prevent an *For statutory citation, see note to § 91.1. For source citation, see note to § 91.200. Page 1273 [1273] accumulation of pressure of more than 10 pounds per square inch above the maximum working air pressure fixed by the chief mechanical officer of the carrier operating the locomotive. (b) Compressor governor. A suitable governor shall be provided that will stop and start the air compressor within 5 pounds above or below the pressures fixed. [As amended Mar. 2, 1936] (c) Governor adjustment. Compressor governor when used in connection with the automatic air-brake system shall be so adjusted that the compressor will start when the main reservoir pressure is not less than 15 pounds above the maximum brake-pipe pressure fixed by the rules of the carrier and will not stop the compressor until the reservoir pressure has increased not less than 10 pounds. (d) Orifice test. The compressor or compressors shall be tested for capacity by orifice test as often as conditions may require, but not less frequently than once every 3 months. This time limit may be increased if upon application to the chief inspector his investigation shows that conditions warrant. (e) Capacity. The minimum capacity of any compressor permitted in service shall be approximately 80 percent of the capacity of the compressor when new. The diameter of orifice, speed of compressor, and air pressure to be maintained for compressors in common use are given in the following tables. For diagram of orifice see Figure 14.*+ EDGES OF FIGURE 14. Page 1274 *For statutory citation, see note to § 91.1. CONDEMNING LIMITS FOR MOTOR-DRIVEN AIR COMPRESSORS Westinghouse Type DH-10-Orifice Size No. 46 Drill=0.081" Diameter Shaft r. p. m. Elevation in feet above sea level Sea level 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8, 000 Westinghouse-Type DH-16-Orifice Size No. 37 Drill=0.104′′ Diameter Westinghouse-Type F-3-B-Orifice Size No. 26 Drill=0.1470" Diameter Westinghouse--Type D-4-N-Orifice Size 5/32'' Drill Westinghouse Types D-4-P and D-4-K-Orifice Size 5/32'' Drill Westinghouse-Types C-60 and XC-60-Orifice Size No. 22 Drill=0.157'' Shaft r. p. m. Diameter Elevation in feet above sea level Com- pressor Motor Sea 3,000 4,000 5,000 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 C-60 XC-60| Minimum gauge pressure in pounds to be maintained |