beginning with the 0-to-150-lpm flow element (FLM-4), proceed as follows: 1. Using hose assembly 3 (figure 1-5), con- nect the top connection of the 500-to-750-mm calibration kit flowmeter 9 (figure 4-4) to test stand flow element connection NIP-4. Using hose assembly 6 (figure 1-5), connect the bottom con- nection of the calibration kit flowmeter to bell jar base coupling C-1. 2. Set flowmeter selector valve V-1 to the 0-to-150-lpm position. Ensure system bleed valve V-5 is closed. NOTE: Flows used shall be taken from the mm column of the calibration correction cards. This previously completed column contains flows in millimeters (mm) equivalent to corresponding lpm flows. 3. Using oxygen supply valve V-6, set the flow equivalent to 150 lpm (from correction card number 4) on the 500-to-750-mm calibration kit flow element. The flow, in inches H₂O, will be displayed on flowmeter indicator PG-2. Enter this reading in the indicated in. H₂O  c o l u m n  of correction card number 4 opposite the actual mm flow being drawn. 4. Reduce the flow to the next millimeter reading by adjusting oxygen supply valve V-6. Repeat step 3. Continue in this manner until all flows on correction card number 4 have been completed. 5. Close oxygen supply valve V-6 and discon- nect the hose and the calibration kit flowmeter from the test stand. NOTE: Hose assembly 3 (figure 1-5) and hose assembly 6 are used in calibrating all linear flow elements. 6 .  C o n n e c t  t h e  t o p  c o n n e c t i o n  o f  t he 250-to-500-mm calibration kit flowmeter to test stand flow element connection NIP-3; connect the bottom connection to bell jar base coupling C-1. Rotate flowmeter selector valve V-1 to the 0-to-50-lpm position. Ensure system bleed valve V-5 is closed. 7. Repeat procedures outlined in steps 3 through 5, using flows given on correction card number 5. 8 .  C o n n e c t  t h e  t o p  c o n n e c t i o n  o f  t he 125-to-250-mm calibration kit flowmeter to test stand flow element connection NIP-2; connect the bottom connection to bell jar coupling C-1. Rotate flowmeter selector valve V-1 to the 0-to-1.0-lpm position. Ensure system bleed valve V-5 is closed. 9. Repeat procedures outlined in steps 3 through 5, using flows given on correction card number 6. 1 0 .  C o n n e c t  t h e  t o p  c o n n e c t i o n  o f  t he 0-to-125-mm calibration kit flowmeter to test stand flow element connection NIP-1; connect the bottom connection to bell jar base coupling C-1. Rotate flowmeter selector valve V-1 to the 0.0-to-0.25-lpm position. Ensure system bleed valve V-5 is closed. 11. Repeat procedures outlined in steps 3 through 5, using flows given on correction card number 7. 12. Disconnect hoses 3 and 6 (figure 1-5) from the calibration kit and test stand. Close oxygen supply cylinder valve V-6 and open system bleed valve V-5 to bleed the test stand. Secure all test stand valves. TROUBLESHOOTING A properly working test stand will give you outstanding results while testing oxygen con- verters. As with any test stand, a small leak in your plumbing system will give you inaccurate readings and may cause you to think you have a defective converter or component. Some parts on the 59A120 test stand must be corrected when they become defective by the on-site meteorology calibration team. You might have a gage that has a pointer which isn’t zeroed, or you might have a flow element that consistently reads low. You could also have a gage that provides correct readings over only part of the scale. In such cases, you will need the calibration team’s assistance to repair the component. Upon completion of any maintenance action, you will be required to fill out a Ground Support Equipment Subcustody and Periodic Maintenance Record (OPNAV 4790/50) and a Ground Support Equipment Custody and Maintenance Record (OPNAV 4790/51). The following problems may occur within your test stand; you, as a senior PR, will be r e q u i r e d  t o  f i x  t h e m .  R e f e r  t o  N A V A IR 17-15BC-20 for parts removal and replacement. PG-1 Reads Low The 0-160 psig pressure gage is used to indicate pressure applied to an item under test. Anytime 1-8