UPDATE 2-Safran considering 500 mln euro bond issue-sources

* Bond issue aims to improve debt profile

* Details on size, timing to be determined - company

* Proceeds not aimed at M&A - source

* Bookrunners are BNP, Calyon, RBS and Societe Generale

(Adds detail, bookrunner names)

PARIS, Nov 9 (Reuters) - French defence, security and aerospace company Safran (SAF.PA) plans a bond issue of 500 million euros ($749 million) or more to extend its debt profile, according to three sources close to the deal.

A Safran spokeswoman confirmed it would launch a bond but would not comment on the size or or other detail, adding the specifics of the bond issue would be decided after an investor roadshow beginning in London on Nov. 13.

According to one source close to the deal, Safran was doing the bond issue to improve its debt profile. "There are no specific acquisitions in the works," the source said.

About 70 percent of Safran's outstanding debt will mature within 12 months. As of June 30, the group's net debt stood at 690 million euros, or 16 percent of its equity assets.