Airworthiness Directive · Amendment 39-16220 · Instruments
Hawker Beechcraft Corporation (Type Certificate Previously Held by Raytheon Aircraft Company) Models B300 and B300C Airplanes
This AD applies to the following airplane models and serial numbers that are certificated in any category:
| Models | Serial Nos. |
|---|---|
| B300 | FL-381, FL-383 through FL-530, FL-532, FL-534 through FL-596, FL-598, and FL-600. |
| B300C | FM-12 through FM-25. |
We are adopting a new airworthiness directive (AD) for certain Hawker Beechcraft Corporation (type certificate previously held by Raytheon Aircraft Company) Models B300 and B300C airplanes. This AD requires you to inspect the terminal board on the circuit card rack assembly to determine if the correct bus bar is installed and replace if necessary. This AD also requires you to do an operational check of the left and right pitot heat annunciators for proper operation and take corrective action as necessary. This AD results from reports of the left and right pitot heat annunciators not illuminating for an inoperative pitot heat condition. We are issuing this AD to detect and correct installation of an incorrect bus bar, which could result in failure of the pitot heat annunciators to illuminate. This failure could lead to the pilot being unaware that moisture has frozen on the pitot tube(s) and cause erroneous flight instrument indication.
To address this problem, you must do the following, unless already done:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Do an operational check of the left and right pitot heat annunciators for illumination | Within the next 15 hours time-in-service (TIS) after April 8, 2010 (the effective date of this AD) or within the next 30 days after April 8, 2010 (the effective date of this AD), whichever occurs first | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
| (2) If the left and/or right pitot heat annunciators do not illuminate, install a placard on the instrument panel within the pilot's clear view specifying the pitot heat annunciator(s) as inoperative | Before further flight after the operational check required in paragraph (f)(1) of this AD | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
| (3) Inspect the terminal board on the circuit card rack assembly to determine if a five-hole bus bar is installed | Within the next 50 hours TIS after April 8, 2010 (the effective date of this AD) or within the next 3 months after April 8, 2010 (the effective date of this AD), whichever occurs first | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
| (4) If a five-hole bus bar is found installed during the inspection required in paragraph (f)(3) of this AD, perform an operational check. If the operational check detects anomalies, contact the manufacturer specified in paragraph (i)(2) of this AD to obtain an FAA-approved repair scheme and incorporate the repair scheme | Before further flight after the inspection required in paragraph (f)(3) of this AD | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
| (5) If a four-hole bus bar is found installed during the inspection required in paragraph (f)(3) of this AD, replace it with a five-hole bus bar and perform an operational check. If the operational check detects anomalies, contact the manufacturer specified in paragraph (i)(2) of this AD to obtain an FAA-approved repair scheme and incorporate the repair scheme | Before further flight after the inspection required in paragraph (f)(3) of this AD | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
| (6) If proper operation of the left and right pitot heat annunciators is verified in paragraphs (f)(4) and (f)(5) of this AD, remove the placard that was installed in paragraph (f)(2) of this AD | Before further flight after doing the operational check required in paragraphs (f)(4) and (f)(5) of this AD | Follow Hawker Beechcraft Mandatory Service Bulletin SB 31-3948, Issued: April 2009. |
Note: The operational check required in this AD is different from the pilot's pre-flight check. An FAA-approved licensed mechanic authorized to do maintenance is required to do the operational check.
(g) The inspection action of paragraph (f)(3) of this AD and the follow-on actions of paragraphs (f)(4) and (f)(5) of this AD may be done instead of the operational check and the placard requirements of paragraphs (f)(1) and (f)(2) of this AD provided the inspection is done within the next 15 hours TIS after April 8, 2010 (the effective date of this AD).
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
