0000898430-01-501029 8-K/A 1 20010403 7 20010614 NORTHROP GRUMMAN CORP /DE/ 0001133421 3812 954840775 DE 1231 8-K/A 34 001-16411 1660948 1840 CENTURY PK E C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 3105536262 1840 CENTURY PARK EAST C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 NNG INC 20010129 8-K/A 1 d8ka.htm FORM 8-K/A - DATED APRIL 3, 2001