TM 55-4920-401-13&P Table  1-14.   Basic  Accessories  Required  for  most  Aircraft  (cont) U-21 AND RU-21 WITH T74 OR PT6 ENGINES . ACCESSORIES REQUIRED WITH BH112JB-53 I 1 1 1 1 1 *2 1 1 1 *2 *1 *1 *1 *1 1 1 1 1 1 1 *1 *1 *2 *1 *1 *1 1 1 ACCESSORIES REQUIRED WITH BH112JB-79 P/N ITEM BH123-3 Switch Box 5930-00-338-2591 BH405 Heater  Cable 4920-00-503-1889 BH450 Check  Cable 4920-00-503-1890 BH485 Instrument  Cable 4920-00-548-7118 BH499A Power  Cable 4920-00-941-6503 BH820A RPM Check Adapters (tach ind) BH821 Insulation Check Adapter 4920-00-549-6093 BH822 Temp Indicator Check Adapter 4920-00-539-9260 BH823 Resistance  Check  Adapter 4920-00-504-3192 BH907 RPM Check Adapter (tach gen) 4920-00-715-4661 BH7424 Check Cable Adapter 4920-00-354-7956 BH14101-40 Heater Probe 6685-00-345-0508 BH14102-40 Continuity Heater Probe 6685-00-345-0507 BH15572 RPM “Y” Adapter BH15184A Interconnect  Cable 4920-01-019-1628 BH15185A Power Cable Adapter 4920-01-020-5328 *These accessories are not included with basic tester. 1-46.3