COMDTINST 16550.5
the original NOTAM request and a copy of the final NOTAM. The LRN
XX/XXX LRN number is the key number and must be included in any future
revisions or cancellations. The first two digits correspond to the month that the
NOTAM is issued; the remaining digits are sequential for that month.
LRN 01/001 LRN CHAIN 9960 UNUSABLE
Explanation: The entire Northeast U.S. Loran-C chain is unusable.
LRN 01/002 LRN CHAIN 9960 STN Y UNUSABLE
Explanation: The yankee secondary of the Northeast U.S. Loran-C chain is
unusable.
LRN 01/003 LRN OMEGA STN B U/S
Explanation: OMEGA station Liberia is out of service.
LRN 04/002 LRN OMEGA PATH DISTURBANCE MAY EXIST ON ALL
FREQS 10.2 KHZ SIGNALS MAY BE IN ERROR AS MUCH AS 3/4 OF A
LANE EFF 12070000
Explanation: Entire OMEGA system may be inaccurate due to path disturbances
effective midnight (zulu time), 07 Dec.
(3)
The following abbreviations are used by the FAA NOTAM office computer
system and may appear on the return receipts:
NFDC - National Flight Data Center
LRN - Long Range Navigation (NOT Loran)
EFF Effective
TIL Until
THRU Through
FDC - Flight Data Center
STN Station
U/S Unservicable
h.
Cancellations and Revisions.
(1)
A revision is required when a scheduled Loran-C or OMEGA unusable period
extends beyond the scheduled period. It is also used to correct inaccurate
NOTAMs. Format NOTAM revisions including the Flight Data Center (FDC)
number(s) as follows:
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