# Airworthiness Directives; Pilatus Britten-Norman Ltd. BN-2, BN- 2A, and BN-2B Series Airplanes
> **Rule** · Final rule. · Published 1998-02-17 · Effective 1998-03-23 · 63 FR 7696
## Document
- **Document number:** 98-3634
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 7696
- **Publication date:** 1998-02-17
- **Effective date:** 1998-03-23
- **FAA docket:** Docket No. 97-CE-12-AD
## Abstract

This amendment supersedes Airworthiness Directive (AD) 97-03- 03, which applies to certain Pilatus Britten-Norman Ltd. (Pilatus) BN- 2, BN-2A, and BN-2B series airplanes that do not have Modification NB/ M/1571 generator terminal diodes installed. AD 97-03-03 currently requires the installation of higher capacity diodes on the generator switches regardless of whether the airplane is equipped with the original 50 amp DC generating system or a Modification NB/M/1148, which is a 70 amp system. This action retains the actions of AD 97-03-03, but modifies the applicability section to reflect that this AD does not apply to Pilatus BN-2, BN-2A, and BN-2B series airplanes with 50 amp DC generation systems installed. This AD is the result of reports that the applicability section of AD 97-03-03 is incorrect. The actions specified by this AD are intended to prevent a loss of electrical power to the navigation, communications, and lighting systems, which could impair the pilot's ability to maintain control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/02/17/98-3634/airworthiness-directives-pilatus-britten-norman-ltd-bn-2-bn--2a-and-bn-2b-series-airplanes)
---
*MORVS · CC0 1.0*