Richard Poulton
Analyst · CJS Securities
Okay. Thanks David, and good morning, everyon. As is customary, I'd like to provide a little more detail on the performance in each of our operating segments, and then I'll conclude with some comments around interest, depreciation and CapEx.
So I'll start with our Supply Chain segment. In our Supply Chain segment, sales increased 21% compared to the year-ago period. We saw real increase in demand from our airline customers, mainly due to our improved product availability, and sales were also higher as a result of our growing distribution business. You should note that the year-over-year growth in this segment equaled or exceeded the year-over-year growth in any other quarter in fiscal '12 after excluding the effects of aircraft transactions earlier in the year. So there's good momentum in this business segment.
Our gross profit margin in the Supply Chain segment was 18.2%, which, while down slightly from Q3, compares very favorably to the year-ago period, as well as Q1 and Q2 of fiscal '12. As we look ahead, we feel good about the investments we made in our Supply Chain business and our position in the market.
In our Government and Defense Services segment, sales declined 21% primarily due to lower program activity in our Defense Systems and Logistics business, including the KC-10 contract charge that we talked about in our release. During the fourth quarter, we recorded that $9.5 million charge as a result of lowering our profit expectation on a portion of the KC-10 support contract. Once again, the adjustment represents the difference between the new profit margin expectation and the previous profit margin expectation for the period of performance that dates back to the inception of the contract, which goes all the way back to February of 2010. So the charge represents a cumulative catch-up adjustment. It is important to emphasize though that the KC-10 contract is still a profitable piece of business for the company.
In addition, the improvements that David noted earlier that we are beginning to experience in our Airlift business are expected to deliver improvements to our financial results in these segment significantly bigger than the impact of the lower margin we will continue to record in the KC-10 contract going forward.
Moving to our MRO segment. Sales increased 14% compared to the prior year, and our gross profit margin was essentially flat at 14.8% from the prior year period, but it was up 300 basis points from Q3. Each of our Airframe MRO centers reported higher sales in the period and remain encouraged by the demand environment.
I'd like to remind everyone that as is typical at this time of the year due to the summer flying season, we would expect first quarter sales will be down in our MRO segment compared to the fourth quarter, but they should compare favorably on a year-over-year basis.
In our Structures and Systems segment, sales increased 70% year-over-year mainly due to the impact of the acquisition of Telair and Nordisk. Our Mobility Products unit also had a very solid quarter. But during the period, we recorded a $3.7 million restructuring charge related to the 3 facilities we are closing, and this impacted our margins during the period. Our gross profit margin in the Structures and Systems segment, excluding these restructuring charges, was 16.8%.
Moving down below the operating profit line. Our net interest expense for the quarter was $11.5 million, up from $8 million last year, and reflects the increased outstanding borrowings related to our acquisition. The cash portion of interest expense was $8.2 million, and our noncash portion of interest expense was $3.3 million.
During our fourth quarter, we generated a strong $76 million in cash flow from operations, and our CapEx was $28 million. And our depreciation and amortization for the quarter was $23.8 million. Looking ahead, our CapEx plan for fiscal '13 is $55 million, which is significantly down from both fiscal '12 and fiscal '11.
During our fourth quarter, we recorded a $3.3 million income tax benefit, which related to changes in book-to-tax return differences. Going forward, we would expect a normal effective tax rate of approximately 35%.
So with that, I want to turn the call back over to David, who will provide some closing comments.