DDG-51 DDG-51
DDG 51 CLASS ADVISORY NR 04-94
PRAIRIE AND MASKER AIR FLOW RATES
REF/A/LTR/AEGIS PROG MGR/18MAR94/217//
REF/B/DOC/CDNSWC/-//
NARR/REF A IS AEGIS PROG MGR SER 400F/217 REVISING DDG 51 CLASS
PRAIRIE AND MASKER AIR FLOW RATES. REF B IS MRC 5516/R-10Q
(72 B7AD N).//
RMKS/1. THE PURPOSE OF THIS CLASS ADVISORY IS TO EMPHASIZE THE
NEW AND REVISED MAINTENANCE/OPERATIONAL PROCEDURES TO IMPROVE
OVERALL PERFORMANCE OF THE PRAIRIE AND MASKER AIR SYSTEM AS
PROMULGATED BY REF A.
2. BACKGROUND.
A. REF A WAS DEVELOPED TO PROMULGATE REVISED PRAIRIE AND
MASKER AIR FLOW RATES. REF A FURTHER STATED ECP-DB-1299 WILL
MAKE THESE CHANGES EFFECTIVE DURING PSA FOR DDG 53 THROUGH 61 AND
DURING CONSTRUCTION FOR DDG 62 AND FOLLOW. DDG 51 AND DDG 52
WILL RECEIVE THE FLOW RATE MODIFICATIONS CONTAINED IN ECP-DB-1299
IN A FUTURE SHIPALT.
B. REF A REDUCED THE MASKER BELT FLOW RATES WHILE
INCREASING THE FLOW TO THE ROPEGUARD AND FAIRWATER EMITTERS. IN
ADDITION TO REVISING THE FLOW RATES, REF A PROVIDED PEN AND INK
CHANGES TO REF B AND THE SHIPS INFORMATION BOOKS.
3. ACTION.
A. REVISED MAINTENANCE/OPERATIONAL PROCEDURES AS PROMULGATED
BY REF A WILL IMPACT PMS AND THE SHIPS INFORMATION BOOKS (SIB).
THE FOLLOWING SUMMARIZED DESCRIPTION HIGHLIGHT THESE NEW
PROCEDURES:
(1) MASKER AIR FLOW RATES FOR EMITTERS 1, 2 AND 3 WILL
BE REDUCED TO 700, 800 AND 900 SCFM RESPECTFULLY.
(2) ROPEGUARD AND FAIRWATER EMITTERS SUPPLY PRESSURE
SHALL BE INCREASED TO 75 PSI.
(3) LOCKING DEVICES SHALL BE ADDED TO MASKER AIR
THROTTLING VALVES TO PREVENT INADVERTENT MANIPULATION.
B. FOR DDG 51 THROUGH 53 COMPLY WITH REF A PARA 3.A(1),
3.A(2) AND 3.C ACTIONS TO ACHIEVE CORRECT FLOW RATES AND
ACCOMPLISH REF A ENCL (3) PEN AND INK PMS PROCEDURAL CHANGES.
C. FOR DDG 54 AND FOLLOW COMPLY WITH REF A PARA 3.B TO
ACHIEVE CORRECT FLOW RATES.
D. FOR DDG 51 THROUGH DDG 54 MAKE PEN AND INK CHANGES TO
VOLUME 6 OF SIB IAW REF A ENCL (1).
4. FOR COMNAVSURFLANT/COMNAVSURFPAC - REQUEST TASK DDG 51 CLASS
SHIPS TO COMPLY WITH PARA 3 ACTIONS.
5. FOR CDNSWC (1413) - ENSURE REF A ENCLOSURE (3) PMS PROCEDURAL
CHANGES ARE INCORPORATED INTO REF B.
6. FOR SUPERVISORS - ENSURE REF A ENCLOSURE (1) AND (2) SIB
CHANGES ARE INCORPORATED FOR SHIPS UNDER YOUR COGNIZANCE.
7. FOR SEA 03YD - CONTINUE DEVELOPING NECESSARY MAINTENANCE AND
OPERATIONAL PROCEDURES FOR POST ECP-DB-1299 INSTALLATION.
8. THIS ADVISORY HAS NO EFFECT ON EOSS OR CMMP. THIS CLASS
ADVISORY WILL BE CANCELLED UPON INCORPORATION OF ECP-DB-1299 INTO
A SHIPALT FOR DDG 51 AND DDG 52 AND REF A PMS MODIFICATIONS TO
REF B.
9. ORIG POC IS MR. N. SMITHSON, PMS400F511, DSN 332-5981,
COMMERCIAL (703) 602-5981 EXT 133.//