Exhibit 99.1350CERT


     Certification Pursuant to Section 906 of the Sarbanes Oxley Act


I, Robert C. Doll, Jr., Chief Executive Officer of BlackRock Fundamental Growth
Principal Protected Fund of BlackRock Principal Protected Trust (the "Fund"),
certify that:

1. The N-CSR of the Fund (the "Report") fully complies with the requirements
   of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material
   respects, the financial condition and results of operations of the Fund.


Dated: April 23, 2007


                                           /s/ Robert C. Doll, Jr.
                                           -----------------------
                                           Robert C. Doll, Jr.,
                                           Chief Executive Officer of
                                           BlackRock Fundamental Growth
                                           Principal Protected Fund of
                                           BlackRock Principal Protected Trust


A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature
that appears in typed form within the electronic version of this written
statement required by Section 906, has been provided to BlackRock Fundamental
Growth Principal Protected Fund of BlackRock Principal Protected Trust and will
be retained by BlackRock Fundamental Growth Principal Protected Fund of
BlackRock Principal Protected Trust and furnished to the Securities and
Exchange Commission or its staff upon request.




Exhibit 99.1350CERT


     Certification Pursuant to Section 906 of the Sarbanes Oxley Act


I, Donald C. Burke, Chief Financial Officer of BlackRock Fundamental Growth
Principal Protected Fund of BlackRock Principal Protected Trust (the "Fund"),
certify that:

1. The N-CSR of the Fund (the "Report") fully complies with the requirements
   of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material
   respects, the financial condition and results of operations of the Fund.


Dated: April 23, 2007


                                           /s/ Donald C. Burke
                                           --------------------
                                           Donald C. Burke,
                                           Chief Financial Officer of
                                           BlackRock Fundamental Growth
                                           Principal Protected Fund of
                                           BlackRock Principal Protected Trust


A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature
that appears in typed form within the electronic version of this written
statement required by Section 906, has been provided to BlackRock Fundamental
Growth Principal Protected Fund of BlackRock Principal Protected Trust and will
be retained by BlackRock Fundamental Growth Principal Protected Fund of
BlackRock Principal Protected Trust and furnished to the Securities and
Exchange Commission or its staff upon request.