DDG-51



Subject:	R 221528Z-DEC-97 DDG 51 CLASS ADVISORY NR. 04-9

ADMINISTRATIVE MESSAGE

ROUTINE

R 221528Z DEC 97  ZYB PSN 625352L23

FM PEO SC WASHINGTON DC//PMS400F//

TO COMNAVSURFLANT NORFOLK VA//N6/N8/N43/N431A6//
COMNAVSURFPAC SAN DIEGO CA//N8/N43/N43111//
AIG ONE THREE EIGHT SIX ONE

INFO COMNAVAIRSYSCOM PATUXENT RIVER MD//JJJ//
AEGIS TRAREDCEN DAHLGREN VA//00/N31/N32/N33/N42//
AEGIS TRAREDCEN DET NORFOLK VA//00//
AEGIS TRAREDCEN DET MAYPORT FL//00//
AEGIS TRAREDCEN DET SAN DIEGO CA//00//
AEGIS TRAREDCEN DET PHILADELPHIA PA//00//
AEGIS TRAREDCEN DET PEARL HARBOR HI//00//
AEGIS TRAREDCEN DET YOKOSUKA JA//00//
AEGIS TRAREDCEN DET WALLOPS ISLAND VA//00//
FCDIT LITTLE CREEK VA//JJJ//

UNCLAS //N08272//ACTION ADDEES OF AIG 13861 TAKE FOR INFO ONLY//

MSGID/GENADMIN/PEO SC//

SUBJ/DDG 51 CLASS ADVISORY NR. 04-97 AMENDMENT 1, HERP-HERO
/GUIDANCE//

REF/A/RMG/PEO SC-AP/171754ZJUN97//

AMPN/REF A IS DDG 51 CLASS ADVISORY NR. 04-97//

RMKS/1.  THIS CLASS ADVISORY AMENDMENT MODIFIES THE GUIDANCE
CONTAINED IN REF A REGARDING HERP PRECAUTIONS IN PORT FOR AN/SPY-1D
HIGH POWER RADIATION.  THIS AMENDMENT REQUIRES THAT THE QUADRATURE
ALIGNMENT OF THE TRANSMITTER BE WITHIN PMS LIMITS WHEN RADIATING HIGH
POWER IN REMOTE CONTROL.  THIS IS NECESSARY TO ENSURE THERE IS NO RF
RADIATION EXCEEDING PERMISSIBLE EXPOSURE LIMIT (PEL) ON THE DECK.
THIS MODIFICATION IS A RESULT OF RECENT TESTS CONDUCTED ABOARD USS
ARLEIGH BURKE.

2.  THE FOLLOWING PARA SHOULD BE INSERTED IN PARA 3.A.(1) FOLLOWING
SUBPARA (2)(B):  "WHEN RADIATING HIGH POWER IN REMOTE CONTROL,
QUADRATURE ALIGNMENT OF THE TRANSMITTER MUST BE WITHIN PMS LIMITS

TO ENSURE THERE IS NO RF RADIATION EXCEEDING PEL LEVELS ON THE DECK.
IF COMPONENTS IN THE RF PATH OF THE RF MONITOR OR DRIVER/PRE-DRIVERS
ARE REPLACED OR ADJUSTED, THEN TRANSMITTER QUADRATURE SHOULD BE
CHECKED OR ALIGNED USING LOCAL CONTROL RADIATION, BEFORE RADIATING
HIGH POWER IN REMOTE CONTROL.  HIGH POWER RADIATION IN MAINTENANCE
MODE UNDER LOCAL CONTROL DOES NOT REQUIRE QUADRATURE ALIGNMENT, NOR
DOES LOW POWER RADIATION IN REMOTE CONTROL OR LOCAL CONTROL."

3.  FOR COMNAVSURFLANT/COMNAVSURFPAC - RECOMMEND DDG 51 CLASS SHIPS
BE TASKED TO MODIFY REF A IAW PARA 2.  ALL OTHER GUIDANCE CONTAINED
IN REF A IS STILL APPLICABLE.

4.  ORIG POC IS MR. N. SMITHSON, PMS400F51H, DSN 332-5981, X133 OR
COMM (703) 602-5981, X133.//

BT